Calculate the Minimum Concentration of Mg²⁺ That Must Be Added

question 79

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]

• A) 1.4 × 10^{7 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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Definitions:

Subcontrary Propositions

In traditional logic, propositions that cannot both be false but can both be true.

Existential Import

The assumption within a statement that asserts the existence of the subject matter it mentions.

Affirmative Subalternate

A proposition that is universally affirmative, implying a particular affirmative proposition as well.

Subcontraries

In the traditional square of opposition, a pair of propositions that, in virtue of their logical form, could both be true but could not both be false (I and O).