Common Ion Effect (HSC SSCE Chemistry): Quizzes

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Common Ion Effect
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What happens to the solubility of a salt when a common ion is added to its saturated solution?

Solubility decreases

When a common ion is added, which direction does the equilibrium shift according to Le Chatelier?

Backwards (to the left)

In a solution of CaSO4\text{CaSO}_4 with added Na2SO4\text{Na}_2\text{SO}_4, what is the common ion?

SO42−\text{SO}_4^{2-}

What is the solubility of CaSO4\text{CaSO}_4 in pure water if Ksp=4.93×10−5K_{sp} = 4.93 \times 10^{-5}?

7.02×10−37.02 \times 10^{-3} mol L−1^{-1}

What is the KspK_{sp} expression for CaSO4(s)⇌Ca2+(aq)+SO42−(aq)\text{CaSO}_4(s) \rightleftharpoons \text{Ca}^{2+}(aq) + \text{SO}_4^{2-}(aq)?

Ksp=[Ca2+]×[SO42−]K_{sp} = [\text{Ca}^{2+}] \times [\text{SO}_4^{2-}]

Why can we approximate (0.100+s)≈0.100(0.100 + s) \approx 0.100 in common ion calculations?

ss is much smaller than 0.1000.100

How much less soluble is AgI in 0.2500.250 mol L−1^{-1} KI compared to pure water?

27 million times less soluble

When does a precipitate form in an ionic solution?

When Qsp>KspQ_{sp} > K_{sp}

What is observed when HCl is added to saturated NaCl solution in the demonstration?

Increased precipitation of NaCl

What happens to solid precipitate when equilibrium shifts backwards due to a common ion?

More solid precipitates out

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