Suggest chemical reactions that could be used to identify the contents of four u

Question

Suggest chemical reactions that could be used to identify the contents of four unlabeled bottles containing solutions of the following substances:
CuSO4, Al2(SO4)3, Pb(NO3)2, FeSO4.

Explanation / Answer

For CUSO4, add potassium carbonate solution. You will get precipitate of copper carbonate. CuSO4+K2CO3->CuCO3+K2SO4 Aluminium sulfate reacts with sodium bicarbonate to which foam stabilizer has been added, producing carbon dioxide gas. Al2(SO4)3+6NaHCO3->Na2SO4+Al(OH)3+CO2 . When heated, lead(II) nitrate crystals decompose to lead(II) oxide, dioxygen and nitrogen dioxide, accompanied by a crackling noise. 2 Pb(NO3)2 (s) ? 2 PbO (s) + 4 NO2 (g) + O2 (g) Upon exposure to air, it oxidizes to form a corrosive brown-yellow coating of basic ferric sulfate, which is an adduct of ferric oxide and ferric sulfate 12 FeSO4 + 3 O2 ? 4 Fe2(SO4)3 + 2 Fe2O3

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