Question

Enough of a monoprotic acid is dissolved in water to produce a 1.11 M solution. The pH of the resulting solution is 2.81. Calculate the K_a for the acid. K_a =

Answer 1

According to theICE table 1.11 1.11-x Therefore (x)(x) Ka from pH 2.81 H,O"-10-231-0.00154 Hence Ka = (0.00154) (0.00154) 1.108 2.09 x 10-6