Dissociation: C2H5CO2H (aq) + H2O(l) ⇌ H3O+(aq) + C2H5CO2- (aq)
Propionic acid, C2H5CO2H (Ka = 1.34 × 10−5), is used in the manufacture of calcium propionate, a food preservative. What is the hydronium ion concentration in a 0.698-M solution of C2H5CO2H?
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