Electrochemical reactions of silver in the presence of chloride and bromide ions were examined using cyclic voltammetry (CV) and electrochemical quartz-crystal microbalance measurements. In the presence of chloride ions, repeated CV cycles caused AgCl to deposit on the electrode. In contrast, reduction of silver ions in the presence of bromide ions to form metallic silver was very slow, and AgBr was not deposited on the gold electrode.