Chemistry Practice Problems Selective Precipitation Practice Problems Solution: What mass of Ca(NO3)2 must be added to 1.0 L of a ...

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Solution: What mass of Ca(NO3)2 must be added to 1.0 L of a 1.0-M HF solution to begin precipitation of CaF2(s)? For CaF2, Ksp = 4.0 X 10 -11 and Ka for HF = 7.2 X 10 -4. Assume no volume change on addition of Ca(NO3)2(s).

Problem

What mass of Ca(NO3)2 must be added to 1.0 L of a 1.0-M HF solution to begin precipitation of CaF2(s)? For CaF2, Ksp = 4.0 X 10 -11 and Ka for HF = 7.2 X 10 -4. Assume no volume change on addition of Ca(NO3)2(s).

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