Solution Equilibria (HSC SSCE Chemistry): Quizzes

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Solubility Equilibrium
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What is the solubility threshold that defines an 'insoluble' compound?

Less than 1 g L−11 \text{ g L}^{-1}

What occurs at dynamic equilibrium in a saturated solution?

Ions leave and rejoin lattice at equal rates

Do all ionic compounds dissolve to some extent in water?

Yes, even 'insoluble' ones dissolve slightly

What is the equilibrium constant for dissolution equilibria called?

Solubility product

For which types of salts can KspK_{sp} be used?

Sparingly soluble or insoluble salts only

What species are included in the KspK_{sp} expression?

Only aqueous ions, not the solid

How are equilibrium equations for dissolution written?

Solid on left, ions on right

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

[Ca2+]×[OH−]2[\text{Ca}^{2+}] \times [\text{OH}^-]^2

In KspK_{sp} expressions, what determines the exponent for each ion?

Its coefficient in balanced equation

What is the KspK_{sp} for BaSO4(s)⇌Ba2+(aq)+SO42−(aq)\text{BaSO}_4(s) \rightleftharpoons \text{Ba}^{2+}(aq) + \text{SO}_4^{2-}(aq)?

[Ba2+]×[SO42−][\text{Ba}^{2+}] \times [\text{SO}_4^{2-}]

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