CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases
Problem
Lactic acid has pKa=3.86. A sample of skeletal muscle has an intracellular pH of 4.86. Approximately what percentage of the total lactic-acid species is present as lactate ion (CH3CH(OH)COO−) in the muscle cell?
(a) About 50\%
(b) About 9\%
(c) About 91\%
(d) About 73\%