The following questions refer to an aqueous 0.085 M sodium acetate solution.
1. What is the equilibrium concentration of [Na+]?
2. What is the equilibrium concentration of the acetate ions?
3. What is the pH of the solution?
1)
equilibrium concentration of [Na+] = 0.085 M
2) CH3COO- + H2O ---------------------> CH3COOH + OH-
0.085 0 0
- x + x +x
0.085 -x x x
Kb = x^2 / 0.085-x = 5.56 x 10^-10
x^2 + 5.56 x 10^-10 x - 4.72 x 10^-11 = 0
x = 6.87 x 10^-6
[CH3COO-] = 6.87 x 10^-6 M
3)
pOH = -log [OH-]
= -log (6.87 x 10^-6)
= 5.16
pH + pOH = 14
pH = 8.84
The following questions refer to an aqueous 0.085 M sodium acetate solution. 1. What is the...
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