A solution contains 1.43×10-2 M ammonium fluoride and 6.08×10-3 M potassium sulfite. Solid calcium nitrate is…

A solution contains 1.43×10-2 M ammonium fluoride and 6.08×10-3
M potassium sulfite. Solid calcium nitrate is added slowly to this
mixture. A. What is the formula of the substance that precipitates
first? B. What is the concentration of calcium ion when this
precipitation first begins?

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