The iоnizаtiоn cоnstаnt of lаctic acid, CH3CH(OH)CO2H, an acid found in the blood after strenuous exercise, is 1.36 × 10-4. What is the concentration of hydronium ion in the solution of 0.222 M lactic acid? CH3CH(OH)CO2H (aq) + H2O (l) → H3O+ (aq) + CH3CH(OH)CO2‾ (aq)