CHEMISTRY · Single correct · AP · Chemistry · Acids and Bases · Acids and Bases
Problem
When solid sodium carbonate dissolves, the carbonate ion reacts with water according to the equilibrium below.
CO32−+H2O⇌HCO3−+OH−
Which statement most accurately describes water's role in this equilibrium?
(a) Water accepts a proton, so it functions as a Brønsted–Lowry base.
(b) Water is amphoteric in general and in this reaction both donates and accepts a proton.
(c) Water donates a proton, so it functions as a Brønsted–Lowry acid.
(d) Water is not acting as an acid or base because its concentration remains essentially constant and therefore is not involved in the equilibrium.