## General Chemistry: Principles and Modern Applications (10th Edition)

(1) $Pb^{2+}_{(aq.)}$ is present because the yellow $PbCrO_4$$_{(s)} is formed. (2) Hg_2^{2+}$$_{(aq.)}$ is absent because the observation of the test for that ion negative. (3) $Pb^{2+}_{(aq.)}$ presence is not confirmed because it really was not tested for.
(1) $Pb^{2+}_{(aq.)}$ is present because the yellow $PbCrO_4$$_{(s)} is formed. (2) Hg_2^{2+}$$_{(aq.)}$ is absent because the observation of the test for that ion negative. (3) $Pb^{2+}_{(aq.)}$ presence is not confirmed because it really was not tested for.