CHM 112 Homework Set #9 Due 1. Determine the hydronium ion concentration and the

Question

CHM 112 Homework Set #9 Due 1. Determine the hydronium ion concentration and the pH of a solution that is 0.10 M NaH2POs and 0.1 5 M Na2HPO4 (the Ka for H:PO4-is 6.2 x 10-8) . Include a chemical equation showing the relevant equilibrium. 2. Finish the chemical equation showing the solubility equilibrium for calcium phosphate. Calculate the molar solubility of Cas(PO4)2 in a 0.20 M Na3P04 solution. As part of your answer, fill in the grid with the relevant numbers or expressions. (Ksp for calcium phosphate is 1.3 x 10-32) (Ksp for calcium phosphate is 1.3 x 10-) Ca3(PO4)2(s) Z Cant OPO Initial Change Equilibrium

Explanation / Answer

Question 1)

Answer :

Pka = - log ka

= - 6.2×10-8

= 7.2076

PH=Pka+[Na2HPo4.NaHPo4]

=7.2074+log(0.13/0.1)

=7.2076+0.1760

=7.3836

Na2Hpo4+H2o=NaH2po4+NapH

Question 2)

Answer:

Ca3(Po4)2(s). =. Ca2+ 2Po4-

Initial - - 0 0

Charge - - +3 +2

Equilibrium - - 3 2

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