CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases
Problem
Acetic acid (HC2H3O2) has Ka=1.8×10−5. Using the approximation that the concentration of undissociated acid remains 0.020 M at equilibrium, which of the following is closest to the calculated pH of the solution?
(a) 2.72
(b) 4.74
(c) 3.22
(d) 2.42