Calculate the Minimum Concentration of Mg²⁺ That Must Be Added

question 53

Multiple Choice

Calculate the minimum concentration of Mg²⁺ that must be added to 0.10 M NaF in order to initiate a precipitate of magnesium fluoride.(For MgF₂ , K_sp = 6.9 × 10^-9.)

• A)1.4 × 10⁷ M
• B)6.9 × 10^-9 M
• C)6.9 × 10^-8 M
• D)1.7 × 10^-7 M
• E)6.9 × 10^-7 M

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