How Many Moles of Ca(NO₃)₂ Must Be Added to 1

question 133

Multiple Choice

How many moles of Ca(NO₃) ₂ must be added to 1.0 L of a 0.12 M HF solution to begin precipitation of CaF₂(s) ? For CaF₂, K_sp = 4.0  10^-11.

• A) 2.8  10^-9 mol
• B) 3.3  10^-10 mol
• C) 5.4  10^-7 mol
• D) 4.8  10^-12 mol
• E) 5.8  10^-13 mol

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