InterviewSolution
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InterviewSolution
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On adding 0.1 M solution each of `Ag^(+), Ba^(2+), Ca^(2+)` ions in a `Na_(2)SO_(4)` solution, species first precipitated is `(K_(sp)BaSO_(4)=10^(-11), K_(sp) CaSO_(4)=10^(-6), K_(sp)Ag_(2)SO_(4)=10^(-5))`A. `Ag_(2)SO_(4)`B. `BaSO_(4)`C. `CaSO_(4)`D. all of these |
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Answer» Correct Answer - B `K_(sp)` for `Ag_(2)SO_(4)=[Ag^(+)]^(2)[SO_(4)^(2-)]` `:. [SO_(4)^(2-)]` for precipitation of `Ag_(2)SO_(4) lt (K_(sp))/([Ag^(+)]^(2))=(10^(-5))/((0.1)^(2))=10^(-3)M` Similarly, `[SO_(4)^(2-)]` for precipitation of `BaSO_(4) lt (K_(sp))/([Ba^(2+)])=(10^(-11))/(0.1)=10^(-10)M` `[SO_(4)^(2-)]` for precipitation of `CaSO_(4) lt (K_(sp))/([Ca^(2+)])=(10^(-6))/(0.1)=10^(-5)M` Thus, minimum `[SO_(4)^(2-)]` reuired for precipitaion is for `BaSO_(4)`. |
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