Question

Which of the following aqueous solution can be added to both BaCl₂(aq) and K₂SO₄(aq),whose identities are unknown, in order to identify them. Give the balanced chemical equations.

HCl, CH₃COOH, NH₄Cl,CaCl,H₂O, NaNO₃, AgNO₃, NaCl, MgCl₂, H₂SO₄,KI, Na₂S, Na₂CO₃, NOH, or KOH

Answer 1

1) CaCl2 solution

To BaCL2(aq) it gives no reaction.

With K2SO4 solution a white precipitate is formed.

K2SO4 (aq) + CaCl2(aq) ------------> CaSO4(s) + 2 KCl(aq)

2) AgNO3 solution

With BaCL2 it gives no reaction.

But with K2SO4 again a white precipitate of Ag2SO4 is formed.

K2SO4(aq) + 2AgNO3(aq) -------------> Ag2So4(s) + 2KNO3(aq)

3) H2SO4 solution

With BaCL2 it gives a white heavy precipitat of BaSO4.

BaCL2(aq) + H2SO4(aq) -------------> BaSO4(s) + 2 HCl(aq)

with K2So4 no reaction.

4) Na2CO3

With BaCL2 it gives a white heavy precipitat of BaCO3

BaCL2(aq) + Na2CO3(aq) -------------> BaCO3(s) + 2 NaCl(aq)

with K2SO4 no reaction

5) NaOh or KOH

with BaCl2 a precipitate of Ba(OH)2 is formed.

BaCL2(aq) + 2KOH(aq) -------------> Ba(OH)2(s) + 2 KCl(aq)

with K2SO4 no reaction