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HgCrO(4) just begins to peripitate when ...

`HgCrO_(4)` just begins to peripitate when equal volumes of `4 xx 10^(-4)M Hg_(2)(NO_(3))_(2)` and `2 xx 10^(-5)M K_(2)CrO_(4)` are combind. What is the approximate `K_(sp)` value of `Hg_(2)CrO_(4)`?

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