$\overline{){\mathbf{K}}_{\mathbf{sp}}\mathbf{}\mathbf{=}\mathbf{\left[}{\mathbf{La}}^{\mathbf{3}\mathbf{+}}\mathbf{\right]}{\mathbf{\left[}{\mathbf{F}}^{\mathbf{-}}\mathbf{\right]}}^{\mathbf{3}}}\phantom{\rule{0ex}{0ex}}\mathbf{2}\mathbf{.}\mathbf{01}\mathbf{}\mathbf{\times}{\mathbf{10}}^{\mathbf{-}\mathbf{19}}\mathbf{}\mathbf{=}\mathbf{}\mathbf{(}\mathbf{0}\mathbf{.}\mathbf{055}\mathbf{)}\mathbf{\left(}\mathbf{3}\mathbf{x}\mathbf{\right)}$

Calculate the solubility of LaF_{3} in grams per liter in a solution that is 0.055 *M* in LaCl_{3}.

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