You choose to investigate some of the solubility guidelines for two ions not listed in Table 4.1, the chromate ion (CrO42-) and the oxalate ion (C2O42-). You are given 0.01 M solutions (A, B, C, D) of four water-soluble salts:


When these solutions are mixed, the following observations are made:


(a) Write a net ionic equation for the reaction that occurs in each of the experiments.
(b) Identify the precipitate formed, if any, in each of the experiments.