Chemistry

Problem

Four beakers each contain

100\;\text{mL}

of aqueous calcium nitrate at the indicated concentration. In which beaker must the fluoride ion concentration be highest to start forming

\mathrm{CaF_2}

precipitate at

25^\circ\text{C}

? (

K_{sp}(\mathrm{CaF_2})

is the same in all cases.) a) [Ca

^{2+}

] = 0.010\;\text{M} b) [Ca

^{2+}

] = 0.0010\;\text{M} c) [Ca

^{2+}

] = 0.020\;\text{M} d) [Ca

^{2+}

] = 0.0050\;\text{M}