Calculate Ka1 and Ka2?Sulfurous acid, H2SO3, dissociates in water in two steps:
H2SO3 + H2O <---> H3O+ + HSO3- ; Ka1 = [H3O+][HSO3-]/[H2SO3]
HSO3- + H2O <---> H3O+ + SO3^2- ; Ka2 = [H3O+][SO3^2-]/[HSO3-]
A 150mL sample of H2SO3 was titrated with 0.10M NaOH. Some measured values of the pH during the titration are given below.
pH 1.4, 1.8, 7.1, 7.6, 10.1, 11.2
mL NaOH 0, 50, 100, 150, 200, 300
1st equiv. pt.: 7.1, 100 2nd equiv. pt.: 10.1, 200
a. Calculate Ka1 and Ka2
b. What is the molarity of the H2SO3 solution?
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