A 100-ML Sample of Solution Contains 10 $\times$ 10^-5

question 55

Multiple Choice

A 100.-mL sample of solution contains 10.0 mmol of Ca²⁺ ion.How many mmol of solid Na₂SO₄ must be added in order to cause precipitation of 99.9% of the calcium as CaSO₄? The K_sp of CaSO₄ is 6.1 $\times$ 10^-5.Assume the volume remains constant.

• A)17.4
• B)10.0
• C)61.0
• D)71.0
• E)6.1

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