Calculate the Minimum Concentration of Mg²⁺ That Must Be Added

question 6

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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