1) A 15.0ML solution of 0.500 M hydrofluoric acid (HF-Ka = 7.2*10 -4 ) is titrat
ID: 525549 • Letter: 1
Question
1) A 15.0ML solution of 0.500 M hydrofluoric acid (HF-Ka = 7.2*10-4) is titrated with a 0.250 M solution of NaOH. Calculate the pH of the solution after the addition of the volume of NaOH Specified.
2) What is the molar solubility of silver carbonate (Ag2CO3)? Ksp = 8.1*10-12.
3) Consider the reaction: 2POCl3 (g) >>>> 2PCl3(g) + O2 (g)
(a) Calculate ( delta Grxn degree = 572 kJ; delta Srxn degree = 179 J/K)
(b) Is the reaction spontaneous or not spontaneous? At what temperature would it reach equilibrium?
Explanation / Answer
Q1. requires volume of NaOH...
Q2.
2) What is the molar solubility of silver carbonate (Ag2CO3)? Ksp = 8.1*10-12.
The solubility dissociation:
Ag2CO3 <--> 2Ag+ + CO3-2
Ksp = [Ag+]^2[CO3-2]
[Ag+] = 2S
[CO3-2] = S
Ksp = (2S)^2(S)
8.1*10^-12 = 4*S^3
S = ((8.1*10^-12)/4)^(1/3)
S = 0.00012651 M of Ag2CO3
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