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The table of diprotic acids below shows how the acidity of the 1st proton is always...

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Chemistry

The table of diprotic acids below shows how the acidity of the1st proton is always much higher than the acidity of the secondproton.Thus, the pH of the solution is dominated by the equilibriumfor the loss of the 1st proton.

CompoundKa1Ka2
H2CO34.3 X 10-75.6 X10-11
H2S8.9 X 10-81.0 X 10-19
H2Te2.3 X 10-31.6 X 10-11
H2SO31.7 X 10-26.4 X 10-8

What is the pH for a 1.12 M solution of Li2S?

Answer & Explanation Solved by verified expert
4.3 Ratings (754 Votes)

Concentration of Li2S = 1.12M

Li2S ------------------ 2 Li+ + S-2

S-2 + H2O ---------------- HS- + OH-

1.12                                      0        0

-x                                        +x          +x

1.12-x                                 +x          +x

Ka = 8.9x10^-8

Ka x Kb = Kw                     where Kw = 1.0x10^-14

Kb = Kw/Ka = 1.0x10^-14/8.9x10^-8 = 1.12 x10^-7

Kb= 1.12x10^-7

Kb = [HS-][OH-]/[S-2]

1.12x10^-7 = x*x/(1.12-x)

for solving the equation

x= 0.000354

[OH-] = 0.000354M

-log[OH-] = -log(0.000354)

POH= 3.45

PH+POH= 14

PH = 14-POH

PH= 14-3.45

PH= 10.55.
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