Solubility Calculations (HSC SSCE Chemistry): Quizzes

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Solubility Calculations
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What are the units of molar solubility?

mol L−1^{-1}

When does the direct relationship between solubility and KspK_{sp} apply?

Only in pure water

What is the KspK_{sp} expression for Ca(IO3)2(s)⇌Ca2+(aq)+2IO3−(aq)\text{Ca(IO}_3)_2(s) \rightleftharpoons \text{Ca}^{2+}(aq) + 2\text{IO}_3^-(aq)?

Ksp=[Ca2+][IO3−]2K_{sp} = [\text{Ca}^{2+}][\text{IO}_3^-]^2

For Zn(OH)2\text{Zn(OH)}_2 with solubility ss mol L−1^{-1}, what is [OH−][\text{OH}^-]?

2s2s mol L−1^{-1}

A salt has solubility of 5.2 g L−1^{-1}. How is it classified?

Sparingly soluble

What is the key difference between QspQ_{sp} and KspK_{sp}?

KspK_{sp} is only at equilibrium

If Qsp>KspQ_{sp} > K_{sp}, what will happen?

A precipitate will form

When calculating solubility from KspK_{sp}, what variable represents the unknown solubility?

ss

For Ksp=s×(2s)2=4s3K_{sp} = s \times (2s)^2 = 4s^3, what operation solves for ss?

Cube root

Which formula converts molar solubility to mass in grams?

m=n×MMm = n \times MM

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