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Q. 10M NaF solution is slowly added with stirring, to a solution that contains 10M Ca(NO3)2 and 10M Cr(NO3)3 .Which salt CaF2 - or - CrF3 precipitates first? The Ksp for CaF2 = 5.3x10^-9 & Ksp for CrF3 = 6.6x10^-11

Q. Compute the concentration of aqueous Ammonia essential to start the precipitation of Zn(OH)2 from a 0.0010 M ZnSO4 solution. Given Analysis are Ksp for Zn(OH)2 = 1.8 x 10-14 & Kb for NH3 =1.8 x 10-5

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