Equal volumes of 0.10 M propanoic acid ( ) and 0.10 M methylamine ( ) are mixed at 25 °C
CHEMISTRY · Single correct · AP · Chemistry · Acids and Bases · Acids and Bases
Problem
Equal volumes of 0.10 M propanoic acid (Ka=1.3×10−5) and 0.10 M methylamine (Kb=4.4×10−4) are mixed at 25 °C. Which statement best describes the pH of the resulting solution?
(a) The pH is around 9 because the base is about 30 times stronger than the acid.
(b) The pH is slightly above 7 because the base is stronger than the acid.
(c) The pH is approximately 7 because the acid and base neutralize each other in a 1:1 ratio.
(d) The pH is slightly below 7 because the conjugate acid produced hydrolyzes more than the conjugate base.