Calculate the Minimum Concentration of Cr³⁺ That Must Be Added

question 56

Multiple Choice

Calculate the minimum concentration of Cr³⁺ that must be added to 0.095 M NaF in order to initiate a precipitate of chromium(III) fluoride.[K_sp(CrF₃) = 6.6 × 10^-11]

• A)0.023 M
• B)0.032 M
• C)7.7 × 10^-8 M
• D)2.9 × 10^-9 M
• E)6.9 × 10^-10 M

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