## Question

###### A solution of $0.1 mathrm{M}$ in $mathrm{Cl}^{-}$and $10^{-4} mathrm{M} mathrm{CrO}_{4}^{-2}$. If solid $mathrm{AgNO}_{3}$ is gradually added to this solution, what will be the concentration of $mathrm{Cl}^{-}$when $mathrm{Ag}_{2} mathrm{CrO}_{4}$ begins to precipitate? $left[mathrm{K}_{e p}(mathrm{AgCl})=10^{-10} mathrm{M}^{2} ; mathrm{K}_{e p}left(mathrm{Ag}_{2} mathrm{CrO}_{4}ight)=10^{-12} mathrm{M}^{3}ight]$(a) $10^{-6} mathrm{M}$(b) $10^{-4} mathrm{M}$(c) $10^{-5} mathrm{M}$(d) $10^{-9} ma

A solution of $0.1 mathrm{M}$ in $mathrm{Cl}^{-}$and $10^{-4} mathrm{M} mathrm{CrO}_{4}^{-2}$. If solid $mathrm{AgNO}_{3}$ is gradually added to this solution, what will be the concentration of $mathrm{Cl}^{-}$when $mathrm{Ag}_{2} mathrm{CrO}_{4}$ begins to precipitate? $left[mathrm{K}_{e p}(mathrm{AgCl})=10^{-10} mathrm{M}^{2} ; mathrm{K}_{e p}left(mathrm{Ag}_{2} mathrm{CrO}_{4} ight)=10^{-12} mathrm{M}^{3} ight]$ (a) $10^{-6} mathrm{M}$ (b) $10^{-4} mathrm{M}$ (c) $10^{-5} mathrm{M}$ (d) $10^{-9} mathrm{M}$

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