91Ó°ÊÓ

Each of the observations listed was made on a different solution. Given the observations, state which ion studicd in this cxperiment is prescnt. If the test is not definitive, indicate that with a question mark. A. Addition of \(6 \mathrm{M} \mathrm{NaOH}\) and \(\mathrm{Al}\) to the solution produces a vapor that turns red litmus blue. Ion prescnt: B. Addition of \(6 \mathrm{M}\) HCl produces a vapor with an acrid odor. Ion present: C. Addition of \(6 \mathrm{M}\) HCl produces an effervescence. Ion present: D. Addition of \(6 \mathrm{M} \mathrm{HNO}_{3}\) plus \(0.1 \mathrm{M} \mathrm{AgNO}_{3}\) produces a precipitate. Ion prescnt: E. Addition of \(6 \mathrm{M} \mathrm{HNO}_{3}\) plus \(1 \mathrm{M} \mathrm{BaCl}_{2}\) produces a precipitate. Ion present: F. Addition of \(6 \mathrm{M} \mathrm{HNO}_{3}\) plus \(0.5 \mathrm{M}\left(\mathrm{NH}_{4}\right)_{2} \mathrm{MoO}_{4}\) produces a precipitate. Ion present:

The chemical reactions that are used in the anion spot tests in this experiment are for the most part simple precipitation or acid-basc reactions. Given the information in cach test procedure, try to write the net ionic equation for the key reaction in each test. A. \(\mathrm{CO}_{3}^{2-}\) B. \(\mathrm{SO}_{4}^{2-}\) C. \(\mathrm{PO}_{4}^{3-}\) (Reactants are \(\mathrm{HPO}_{4}^{2-}, \mathrm{NH}_{4}^{+}, \mathrm{MoO}_{4}^{2-},\) and \(\mathrm{H}^{+} ;\) products are \(\left(\mathrm{NH}_{4}\right)_{3} \mathrm{PO}_{4} \cdot 12 \mathrm{MoO}_{3}\) and \(\mathrm{H}_{2} \mathrm{O}\) no oxidation or reduction occurs.) D. \(\mathrm{SO}_{3}^{2-}\) E. \(\mathrm{SCN}^{-}\) F. \(\mathrm{Cl}^{-}\) G. \(\mathrm{NO}_{3}^{-}\) (Take as reactants \(\mathrm{Al}\) and \(\mathrm{NO}_{3}\); as products \(\mathrm{NH}_{3}\) and \(\mathrm{AlO}_{2}\); final cquation also contains \(\mathrm{OH}^{-}\) and \(\mathrm{H}_{2} \mathrm{O}\) as reactants.)