Equal volumes of 1 x 10-4 M solutions of Cd2+ and CO32- ions are mixed in one fl

Question

Equal volumes of 1 x 10-4 M solutions of Cd2+ and CO32- ions are mixed in one flask and equal volumes of 1 x 10-4 M solutions of Ag+ and CrO42- ions are mixed in a second. Which substances precipitate given that the Ksp values of CdCO3 and Ag2CrO4 are 5.2 x 10-12 and 1.1 x 10-12 respectively?

Explanation / Answer

1/2 eqns: Ni^2+ + 2e- --> Ni(s) E0: -0.24V Zn^2+ + 2e- --> Zn(s) E0: -0.76V the lowest reduction voltage gets reversed as its most readily oxidised (loss of electrons) ie Zn becomes oxidised therefore, Zn+ Ni^2+ --> Zn^2+ Ni .. E0: -0.24 -(-0.76) = 0.52V in answer to your question, yes, it can be said. ofcourse, under non-standard conditions, the nerst equ must be used.

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