Calculate the Minimum Concentration of Mg²⁺ That Must Be Added

question 38

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.[K_sp(MgF₂) = 6.9 × 10^-9] rev: 08_14_2014_QC_52437

• 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