This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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Here are the observations for the anion tests: Br⁻ Reagent: HNO₃/AgNO₃(aq) then Conc NH₃ Observation: Cream precipitate formed. Precipitate is soluble in concentrated NH₃.* I⁻ Reagent: HNO₃/AgNO₃(aq) then Conc NH₃ Observation: Yellow precipitate formed. Precipitate is insoluble in concentrated NH₃.* CO₃²⁻ Reagent: MgSO₄(aq) at r.t.p. Observation: White precipitate formed.* HCO₃⁻ Reagent: MgSO₄(aq) + boiling Observation: No precipitate formed at r.t.p. White precipitate formed on boiling.* NO₃⁻ Reagent: FeSO₄(aq) + conc. H₂SO₄, no shaking Observation: A brown ring formed at the junction of the two layers.* NO₂⁻ Reagent: FeSO₄(aq) + conc. H₂SO₄, no shaking Observation: Brown solution or brown ring formed.* SO₄²⁻ Reagent: Pb(CH₃COO)₂(aq), Heat then cool. Observation: White precipitate formed. Precipitate dissolves on heating and reappears on cooling.* I⁻ Reagent: Pb(CH₃COO)₂(aq), Heat then cool. Observation: Yellow precipitate formed. Precipitate dissolves on heating to form a colorless solution and reappears as golden-yellow flakes on cooling.* CH₃COO⁻ Reagent: FeCl₃(aq) at r.t.p Observation: Blood-red coloration formed.* S₂O₃²⁻ Reagent: FeCl₃(aq) at r.t.p Observation: Transient violet coloration formed, which quickly fades.* CrO₄²⁻ Reagent: AgNO₃(aq) + NH₃(aq) then dil HNO₃ Observation: Reddish-brown precipitate formed. Precipitate dissolves in NH₃(aq) and reappears upon addition of dil HNO₃.* Cr₂O₇²⁻ Reagent: Dil. SnCl₂(aq) Observation: Orange solution turns green.* That's 2 down. 3 left today — send the next one.