Osmosis is the flow of a solvent into a solution through a semipermeable membrane. So you can only have three significant figures for any given phosphate species. Sodium Phosphate. Because the concentration of water is extremely large and virtually constant, the water is not included in the expression. Acid pH = Base Hydrolysis Reaction Ka Kb 2.4E-02 pka E pKb Calculations: The ionization for a general weak acid, HA, can be written as follows: Because the acid is weak, an equilibrium expression can be written. Answer to: Consider an aqueous 1.00 m solution of Na3PO4, a compound with useful detergent properties (kb = 0.51 C m-1). (K. = 7.5 x 10-3, Ka, = 6.2 x 10-8, K, = 4 x 10-13) What is the poth, 0.5 m Na solution Paperport your answer a: Calculate the pH of a 0.300 M Na3PO4 solution. Given the acid constant for a weak acid . Toggle mobile menu. In the U.S., trisodium phosphate is an approved flux for use in hard soldering joints in medical-grade copper plumbing. Explanation: The molar mass of sodium phosphate is M r = (3 23) + 31+ (4 16) = 164g/mol. {{ nextFTS.remaining.months > 1 ? The logarithmic constant (pKa) is equal to -log10(Ka). us from charging the card. H I think that is what you call it. So we start with 0.090 mol of both NH4 + and NH 3.After complete reaction with 0.0010 mol NaOH the resulting amounts of each are: 0.090 0.0010 = 0.089 mol NH4 0.090 + 0.0010 = 0.091 mol NH3 To use Henderson-Hasselbalch equation we need to know the pKa value. Solution for What is the percent ionization of HNNH in a solution with a concentration of a 0.580 M? PO43 + H2OHPO42 + OH ; Kb = 2.4 102. 1.62 g/cm. Higher T will have a higher boiling point. The (aq) shows that they are aqueous dissolved in water.The equation for Na3PO4 ( Sodium phosphate and H2O sometimes isnt considered a chemical reaction since it is easy to change the Na + and PO4 3- back to Na3PO4 (just let the H2O evaporate). So we start with 0.090 mol of both NH4 + and NH 3.After complete reaction with 0.0010 mol NaOH the resulting amounts of each are: 0.090 - 0.0010 = 0.089 mol NH4 0.090 + 0.0010 = 0.091 mol NH3 To use Henderson-Hasselbalch equation we need to know the pKa value. Relevance. The acid ionization represents the fraction of the original acid that has been ionized in solution. It may not display this or other websites correctly. The normal freezing point of water is 0.0C. did you know that the right answer was 10 all along? Use table search to locate desired compound in database. How many grams of Na3PO4 will be needed to produce 575mL of a solution that has a concentration of Na^+ ions of 1.40 M? speed set mortar working time of thinset; best choice products jeep parts; zulu social aid and pleasure club posters Boiling Point. E) 8. pH = Conjugate Acid Base Hydrolysis Reaction - ka Kb 7.52 E pka pkb Calculations: Experts are tested by Chegg as specialists in their subject area. The Kb for NH3 is 1 10-5. The acid ionization represents the fraction of the original acid that has been ionized in solution. Acids. Due to high demand and limited spots there is a waiting list. {{ nextFTS.remaining.months > 1 ? The pH of a solution is a measure of the molar concentration of hydrogen `(H^+)` , or hydronium `(H_3O^+)` ions of the solution. What is the osmotic pressure of a solution prepared by adding 13.65 g of sucrose (C 12 H 22 O 11) to enough water to make 250 mL of solution at 25 C? By clicking Buy Now! The boiling point of the solvent above a solution will be greater than the boiling point of the pure solvent whether the solution contains a non-volatile solute or a volatile solute. Phosphates are available from a number of other sources that are much milder than TSP. Aweak acidis an acid that ionizes only slightly in an aqueous solution. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. 31 164 100 = 18.9%P. Conjugate Acid-Base Pairs. there are fewer water molecules in the vapor (i.e., lower vapor pressure) above the NaCl solution than in the vapor above pure water, and. For example: CH3COOH pKa=4.76 c=0.1 HCl pKa=-10 c=0.1 Case 2. m is the molal concentration of the solute in the solution. Here are some of the values of weak and strong acids and bases dissociation constants used by BATE when calculating pH of the solution and concetrations of all ions present. Expert Answer. Therefore, the numerical value ofKais a reflection of the strength of the acid. 1. Calculate the pH of a 0.0798 M H3PO4 solution. Equation or enables us to calculate the base constant of a conjugate base from the acid constant of the acid, and vice versa. 'months' : 'month' }}, {{ nextFTS.remaining.days }} 'days' : 'day' }} CCRIS 7086. Acids are classified as either strong or weak, based on their ionization in water. 'days' : 'day' }}, {{ nextFTS.remaining.months }} These values are usually not measured but calculated from thermodynamical data and should not be treated too seriously. An equilibrium expression can be written for the reactions of weak bases with water. Requested URL: byjus.com/chemistry/sodium-phosphate/, User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.114 Safari/537.36 Edg/103.0.1264.62. B) Strong acid vs. weak base. What is the pH of 1.0 M Na3PO4 in aqueous solution ? It is considered the solvent in these reactions, so the concentration stays essentially constant. pH = Conjugate Acid Base Hydrolysis Reaction Kb c pka E pKb 10.66 Calculations: 58 Table 2. nKa Values / Acid . Still have questions? NaCl is added slowly to a solution that is 0.010 M each in Cu+, Ag+, and Au+. KCl is neutral because KOH is a strong base and HCl is a strong acid. To show that they are dissolved in water we can write (aq) after each. double check my worki just did this on a napkin and wolfram haha you're lucky i'm bored out of my mind at workhaven't typed up a solution like that in a long time Find the molarity first. For the definitions of Kan constants scroll down the page. Molecular Weight/ Molar Mass. pH = Conjugate Acid Base Hydrolysis Reaction Kb c pka E pKb 10.66 Calculations: 58 TSP is used as a cleaning agent, builder, lubricant, food additive, stain remover, and degreaser. 4 What is the pOH of a .22 M NaOH solution? {{ nextFTS.remaining.months }} Screen capture done with Camtasia Studio 4.0. Unless otherwise stated, pKa and pKb was measured at STP. (Kb = 1.3 10) The site owner may have set restrictions that prevent you from accessing the site. Equilibrium: The state of a reaction in which the rates of the forward and reverse reactions are equal. m is the molal concentration of the solute in the solution. C) 9. Disclaimer - accuracy of the values shown, especially for the strong acids, is questionable. pH calculator program - Base Acid Titration and Equilibria - dissociation constants pKa and pKb. As for pKb values of strong bases - NaOH, KOH, LiOH, Ca(OH)2 - pleas read the explanation in our FAQ section. T=iK bm, where i = van Hoff's factor, K b = boiling point elevation constant, m = molality. B) 9. If 0.50 mole of BaCl2 is mixed with 0.20 mole of Na3PO4 , the maximum number of moles of Ba3 (PO4)2 that can be formed is . {{ notification.creator.name }} {{ nextFTS.remaining.days > 1 ? For this reason,Kavalues are generally reported for weak acids only. For reference or additional information, please contact websupport@aatbio.com, Click here to see all available distributors, https://www.aatbio.com/data-sets/pka-and-pkb-reference-table, (nitrilotris(methylene))triphosphonic Acid, 1(2h)-Pyrimidinecarboxamide, 5-Fluoro-3,4-Dichlo, 1(2h)-Pyrimidinecarboxamide, 5-Fluoro-3,4-Dihydr. Thanks a ton guys.. christopher clarke missing; what is walter mittys fourth daydream; June 8, 2022 kb of na3po4 Trisodium phosphate is produced by neutralization of phosphoric acid using sodium carbonate, which produces disodium hydrogen phosphate. Conjugate acids (cations) of strong bases are ineffective bases. In this video we'll write the correct name for Na3PO4.To write the name for Na3PO4 well use the Periodic Table and follow some simple rules. {{ nextFTS.remaining.days > 1 ? 'days' : 'day' }}. Because Na3PO4 . By the end of the 20th century, many products that formerly contained TSP were manufactured with TSP substitutes, which consist mainly of sodium carbonate along with various admixtures of nonionic surfactants and a limited percentage of sodium phosphates. Operating systems: XP, Vista, 7, 8, 10, 11. In the Western world, phosphate usage has declined owing to ecological problems with the damage to lakes and rivers through eutrophication. This compound is also known as Trisodium Phosphate. Assume no volume change upon the addition of base. FOIA. CHEM 1412. Review for Test 1 (chapter 13, 14, 15). A large Kb value indicates the high level of dissociation of a strong base. How To Remove Scratches From Chrome Plating. National Institutes of Health. PO43- + H2O HPO42- + OH- ; Kb (PO4-3) = 2.4 10-2. You have the the following six independent equations in order to specify the unknown concentrations of six species as present in an aqueous solution consisting of $\pu{0.1 M}$ $\ce{H3PO4}$ and $\pu{0.05M}$ $\ce{Na3PO4}$: Table 2. nKa Values / Acid-Salts Sodium. {{ nextFTS.remaining.days }} D The overall dissolution of LiCl is exothermic; this is indicated by the temperature of the water rising. A) Strong acid vs. strong base. Jawaban - Manakah diantara berikut titik beku yang paling tinggi nh4c1 0,1 m na3po4 0,1m al2(so) 0,1m co(nh2)2 0,1m - jawaban-sekolah.com pKa: A quantitative measure of the strength of an acid in solution; a weak acid has a pKa value in the approximate range 2 to 12 in water and a strong acid has a pKa value of less than about 2. A) 9. Ky75, Page 5 24. 1(2h)-Pyrimidinecarboxamide, N-Butyl-5-Fluoro-3, 1h-Imidazole, 4,5-Dihydro-2-(phenylmethyl)-, 1h-Purine-2,6-Dione, 3,9-Dihydro-1,3-Dimethyl-, 2,2-Bis(4-Hydroxy-3,5-Dibromophenyl)propane, 2,3-Butanediol, 1,4-Dimercapto-, (r-(r*,r*))- (9, 2,4-Pyrimidinediamine, 5-(3,4-Dichlorophenyl)-6-, 2,8,9-Triisobutyl-2,5,8,9-tetraaza-1-phosphabicyclo[3.3.3]undecane, 2,8,9-Trimethyl-2,5,8,9-tetraaza-1-phosphabicyclo[3.3.3]undecane, 2-((4-(dimethylamino)phenyl)azo)benzoic Acid, 2-(2,4-Dimethoxyphenyl)-5-Methylbenzimidazole, 2-(2,4-Dimethylphenyl)-5-Nitrobenzimidazole, 2-(4-Aminophenylmethyl)-5-Chlorobenzimidazole, 2-(4-Bromophenylmethyl)-5-Chlorobenzimidazole, 2-(4-Chlorophenyl)-Imidazo[4,5-B]pyridine, 2-(4-Chlorphenylmethyl)-5-Chlorobenzimidazole, 2-(4-Fluorophenyl)-Imidazo[4,5-B]pyridine, 2-(4-Methoxyphenylmethyl)-5-Nitrobenzimidazole, 2-(4-Methylphenyl)-Imidazo[4,5-B]pyridine, 2-(4-Methylphenylmethyl)-5-Chlorobenzimidazole, 2-(4-t-Butylphenyl)-Imidazo[4,5-B]pyridine, 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5-(4-Chlorophenyl)oxymethyl-2-Amino-2-Oxazoline, 5-(4-Methoxyphenyl)oxymethyl-2-Amino-2-Oxazoline, 5-(4-Methylphenyl)oxymethyl-2-Amino-2-Oxazoline, 5-(4-Nitrophenyl)oxymethyl-2-Amino-2-Oxazoline, 5-(4-n-Morpholinophenyl)oxymethyl-2-Amino-2-Oxaz, 6-Nh2-5-(n-Methylformylamino)-1,3-Dimethyluracil, 6-Nh2-5-(n-Methylformylamino)-3-Methyluracil, Acetic Acid, 2-[[5-(aminosulfonyl)-2-Thienyl]sul, Acetic Acid, 3-[4-(aminosulfonyl)phenyl]propyl E, Acetic Acid, 3-[[5-(aminosulfonyl)-2-Thienyl]sul, Acetic Acid, 5-[4-(aminosulfonyl)phenyl]pentyl E, Benzamide, 5-Bromo-2-Hydroxy-N,3-Dimethyl-, Benzeneacetic Acid, .alpha.-Hydroxy-.alpha.-Meth, Benzeneacetic Acid, 4-(1,1-Dimethylethyl)-, Benzenemethanol, .alpha.-(1-Aminoethyl)-, (r*,r*, Benzenemethanol, _-[1-(dimethylamino)ethyl]-, (r, Benzenesulfonamide, 3-Amino-4-[(2-Hydroxyethyl)s, Benzenesulfonamide, 3-Amino-4-[(3-Hydroxypropyl), Benzenesulfonamide, 3-Chloro-4-[(3-Hydroxypropyl, Benzenesulfonamide, 3-Fluoro-4-[(2-Hydroxyethyl), Benzenesulfonamide, 3-Fluoro-4-[(3-Hydroxypropyl, Benzenesulfonamide, 3-Fluoro-4-[(4-Hydroxybutyl), Benzenesulfonamide, 4-[(2-Hydroxyethyl)sulfonyl], Benzenesulfonamide, 4-[(2-Hydroxyethyl)thio]-, Benzenesulfonamide, 4-[(2-Hydroxyethyl)thio]-3-n, Benzenesulfonamide, 4-[(3-Hydroxypropyl)sulfonyl, Benzenesulfonamide, 4-[(3-Hydroxypropyl)thio]-, Benzenesulfonamide, 4-[(3-Hydroxypropyl)thio]-3-, Benzenesulfonamide, 4-[(4-Hydroxybutyl)sulfonyl], Benzenesulfonamide, 4-[(4-Hydroxybutyl)thio]-, Benzenesulfonamide, 4-[(5-Hydroxypentyl)thio]-, Benzenesulfonamide, 4-[3-Hydroxy-3-Methylbutyl)s, Benzenesulfonamide, 4-[3-Hydroxy-3-Methylbutyl)t, Benzenesulfonamide, 4-[[2-[(2-Methylpropyl)amino, Benzoic Acid, 2,3,5,6-Tetrafluoro-4-Methyl-, Benzoic Acid, 5-(aminosulfonyl)-2-[(2-Hydroxyeth, Benzoic Acid, 5-(aminosulfonyl)-2-[(3-Hydroxypro, Butanamide, 2-Amino-n-(2,6-Dimethylphenyl)-, Cinnamic Acid, 4-Hydroxy-3-Methoxy-, (e)-, Ethanamine, N,n-Dimethyl-2-[5-Methyl-2-(1-Methyl, Hydrazinecarboxamide, 2-(phenylmethylene)-, Imidazo[5,1-B]quinazolin-9(2h)-One, 1,3-Dihydro-, Imidazo[5,1-B]quinazolin-9(2h)-One, 2-Butyl-1,3-, Phenol, 2,2'-((1-Methyl-1,2-Ethanediyl)bis(nitri, Piperidine, 1-(4,4-Dimethyl-1-Phenylcyclohexyl)-, Propanoic Acid, 2-(2,4-Dichlorophenoxy)-, (r)-, Thieno[2,3-B]furan-2-Sulfonamide, 5-(4-Morpholin, Thieno[2,3-B]furan-2-Sulfonamide, 5-[[(2-Fluoroe, Thieno[2,3-B]thiophene-2-Sulfonamide, 5-[[(2-Hyd, Thieno[2,3-B]thiophene-2-Sulfonamide, 5-[[(2-Met, Thieno[2,3-B]thiophene-2-Sulfonamide, 5-[[[2-(me, Thieno[3,2-B]thiophene-2-Sulfonamide, 5-[[(2-Met. remaining Department of Health and Human Services. kcabwalc sdliug . {{ nextFTS.remaining.days > 1 ? At the same time, the Na3PO4 is a very different substance than Na + and PO4 3-.If you need to know how to balance chemical reactions, see my complete tutorial on balancing all types of chemical equations:Balancing Equations in 5 Easy Steps: https://youtu.be/zmdxMlb88FsMore Practice Balancing: https://youtu.be/Qci7hiBy7EQDrawing/writing done in InkScape. On the contrary inorganic bases - like NaOH, KOH, LiOH, Ca(OH)2 - increase pH dissociating. BPP Marcin Borkowskiul. Done on a Dell Dimension laptop computer with a Wacom digital tablet (Bamboo). Astrong acidis an acid which is completely ionized in an aqueous solution. Solution: Osmosis and osmotic pressure are related. The acid dissociation constant (Ka) is a quantitative measure of the strength of an acid in solution while the base dissociation constant (Kb) is a measure of basicitythe base's general strength. LIVE Course for free. Thus the product of the acid constant for a weak acid and the base constant for the conjugate base must be Kw, and the sum of p Ka and p Kb for a conjugate acid-base pair is 14. Then, calculate the molality of the solution. Calculate the pH of a 0.20 M Na3PO4 solution. Rock - if you dont mind me asking what was your DAT score? where: T is the change in boiling point of the solvent, Kb is the molal boiling point elevation constant, and. Kb is the molal boiling point elevation constant, and Calculate the pH of the solution containing 3.875g of Na 2 HPO 4 (MW. Acids are classified as either strong or weak, based on their ionization in water. How do you arrange these aqueous solutions in order of decreasing freezing point: 0.10 m Na3PO4, 0.35 m NaCl, 0.20 m MgCl2, 0.15 m C6H12O6, and CH3OOH? [citation needed] This mixture is particularly effective for removing mildew, but is less effective at removing mold. Register; Test; JEE; NEET; . Recently Asked Questions (1.0000x10^1) mL aliquots of a phosphoric acid solution with an unknown concentration is titrated with some (2.99x10^-1) mol/L sodium hydroxide solution.The; A solution turnsmethyl redred andbromocresol greengreen.What is a possible pH of the solution? What is the percent CsCl by mass in a 0.711 M CsCl solution that has a density of 1.091 Use table search to locate desired compound in database. How many moles of sodium ions are present in 2.50 L of 0.300 M Na3PO4? Why is a sodium phosphate buffer used for the pH 6.24 buffer? In this case find and write both names as found on the Common Ion Table.-----------------------------For a complete tutorial on naming and formula writing for compounds, like Sodium phosphate and more, visit:http://www.breslyn.org/chemistry/namingDrawing/writing done in InkScape. a: Na3PO4 and AgNO3 b: K2SO4 and Na2CO3 C: Pb(NO3)2 and Na2CO3 d: BaCl2 and KOH. For that to be the case, the energy released during when the ion-dipole attractions form has . The figure below shows a microscopic view of the surface of pure water. If 0.50 mole of BaCl2 is mixed with 0.20 mole of Na3PO4 , the maximum number of moles of Ba3 (PO4)2 that can be formed is . The following graph shows the normal boiling point for water (solvent) as a function of molality in several solutions containing sucrose (a non-volatile solute). While TSP is not toxic per se, it is severely irritating to gastric mucosa unless used as part of a buffered solution. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students. Assuming equal concentrations, rank these aqueous solutions by their freezing point: LiSO4, Li3PO4, SnCl4, NH4Br. For which type of titration will the pH be basic at the equivalence point? (Ka=6.2x10^-10) is quite lower than the the Kb of NH4OH (Kb=1.8x10^-5). Ka2 = 6.34 x 10 ^ -8. Potassium Nitrite Calculate the pH of 0.10 M KNO2 solution. The cation is Na^+ (it has a charge of +1) and there are three of them. This is a recorded trial for students who missed the last live session. For the definitions of Kbn constants scroll down the page. Calculate the pH of a solution formed by mixing 250 mL of 0 M NH4Cl with 100. mL of 0 M NH3. Step 3: Think about your result. Phosphate ions are used as a buffer because there are three protonated forms (H3PO4, H2PO4-, and HPO42-) that have pKa in the correct . 'Starts Today' : 'remaining' }} As with acids, bases can either be strong or weak, depending on their extent of ionization. Chemistry Question Pack Passage 13 Question 77, Chemistry Question Pack Passage 16 Question 88, Sample Test C/P Section Passage 6 Question 30, Practice Exam 4 C/P Section Passage 1 Question 2, Practice Exam 4 C/P Section Passage 4 Question 18. JavaScript is disabled. Thus, Na 3PO 4 has the highest boiling point. View the full answer. = 141.98 g/mol) that has been dissolved in a 250 mL volumetric flask and diluted to the mark. Depending on the source pKa for HCl is given as -3, -4 or even -7. The disodium hydrogen phosphate is reacted with sodium hydroxide to form trisodium phosphate and water. 'months' : 'month' }} A lower pKb value indicates a stronger base. Therefore, the numerical value of. SQ is square rootthat's basically a shortcut formula to what you would get if you did the ICE box. Non-Zwitterionic Buffer Compound Formula MW Solubility pKa at 20 C g/100 mL of H2O at 20 C 1 2 3 Boric Acid H3BO3 61.8 6.4 Trisodium phosphate was at one time extensively used in formulations for a variety of consumer-grade soaps and detergents, and the most common use for trisodium phosphate has been in cleaning agents. I need to find the pH of a solution containing 50 grams of Na3PO4. Get Answer. Potassium Nitrite Calculate the pH of 0.10 M KNO2 solution. If 0.50 mole of BaCl2 is mixed with 0.20 mole of Na3PO4 , the maximum number of moles of Ba3 (PO4)2 that can be formed is . * Compiled from Appendix 5 Chem 1A, B, C Lab Manual and Zumdahl 6th Ed. The boiling point of the solvent above a solution changes as the concentration of the solute in the solution changes (but it does not depend on the identity of either the solvent or the solute(s) particles (kind, size or charge) in the solution). you must have since you knew your 5 was wrong, right? Calculate the pH of 0.5 M Na3PO4 in aqueous solution ? 2. Ka and pKa. Many compounds of pharmaceutical interest are formulated in sodium phosphate buffers. Trisodium phosphate solution. pKa and pKb are the logarithmic scales of Ka and Kb. 1 Answer. When a solute is added to a solvent, the vapor pressure of the solvent (above the resulting solution) is less than the vapor pressure above the pure solvent. PO Error: equation KI+Na3PO4=KNa+IPO4 is an impossible reaction Please correct your reaction or click on one of the suggestions below: KI + Na3PO4 = K3PO4 + NaI KI + Na3PO4 = KPO4 + Na3I Instructions and examples below may help to solve this problem You can always ask for help in the forum Why aluminium nitride AlN has higher melting point than Lithium oxide? Calculate the pH of the solution after the addition of 0 moles of solid LiOH. Note that the normal boiling point of water increases as the concentration of sucrose increases. Name the metal (the cation) as it appears on the Periodic Table. Spark, {{ nextFTS.remaining.months }} Osmosis is the flow of a solvent into a solution through a semipermeable membrane. A strong acid is an acid which is completely . You must log in or register to reply here. Now let's try some numbers. For H3PO4, Ka1 = 7.5 103, Ka2 = 6.2 108, and Ka3 = 4.2 1013., What is the pH of a solution that has 0.250 M HF and 0.250 M HClO? 'days' : 'day' }} For the reactions of dissociation of base: Next dissociation steps are trated the same way. The simplifying assumption is that. Acid pH = Base Hydrolysis Reaction Ka Kb 2.4E-02 pka E pKb Calculations: Contact. Acids with a pKa value of less than about -2 are said to be strong acids. (from highest freezing point to lowest freezing poinT) Thanks. How many grams of Na3PO4 will be needed to produce 450 mL of a solution that has a concentration of Na+ ions of 0.700 M; A scientist wants to make a solution of tribasic sodium phosphate,Na3PO4 , for a laboratory experiment. Answer: E. A 1 L buffer solution is 0 M in HF and 0 M in LiF. This shows sodium phosphate to be about 42.07% sodium by mass. Chemistry(Please help, thank you!!!) . However, for simplicity, only non-volatile solutes will be considered here. Unless otherwise stated, pKa and pKb was measured at STP. For a better experience, please enable JavaScript in your browser before proceeding. pKa (HNO3)=-1.4 so Ka (HNO3)=25.119. in these problems, being on the wrong side of neutral is the red flag that you picked the wrong direction (gaining/losing a proton). As we can see in the second step, HPO is the conjugate base of HPO. . 1 x 10-14 = K a*Kb Ka = 1x10-14/1.8x10-5 = 5.6 x 10-10 (or look up in table) So, [10], With the formula The item of commerce is often partially hydrated and may range from anhydrous Na3PO4 to the dodecahydrate Na3PO412H2O.