Problem: Which solution will form a precipitate when mixed with a solution of aqueous Na2CO3?a) KNO3(aq)b) NaBr(aq)c) NH4Cl(aq)d) CuCl2(aq)

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Na2CO3 (aq) → 2 Na+ (aq) + CO32- (aq)


a) KNO3(aq) → K+ (aq) + NO3- (aq)

Na(aq) + NO3- (aq) → NaNO3 → all nitrates are soluble → aqueous

K(aq) + CO32- (aq) → K2CO3 → soluble carbonates → aqueous


b) NaBr(aq) → Na+ (aq) + Br- (aq)

Na(aq) + Br- (aq) → NaBr → soluble halide → aqueous

Na+ (aq) + CO32- (aq) → Na2CO3 → soluble carbonate → aqueous


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Problem Details

Which solution will form a precipitate when mixed with a solution of aqueous Na2CO3?
a) KNO3(aq)
b) NaBr(aq)
c) NH4Cl(aq)
d) CuCl2(aq)

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