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Solubility of Rb2S, Li2Cr2O7, Cu(ClO4)2

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Is Rb2S, Li2Cr2O7, Cu(ClO4)2 insoluble or soluble and why?

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The rules of solubility say:
1. All Sulfide (S-2) salts are insoluble except those of Group 1 and Group 2 elements and Ammonium (NH4+). This tells us that Rb2S ...

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