CAIE A Level Chemistry 9701 · Equilibria

Equilibria: describe question

Describe5 marksChallenge

Lead(II) chloride is sparingly soluble in water. Its solubility equilibrium is represented by the equation

\ce{PbCl2(s) <=> Pb^{2+}(aq) + 2Cl^{-}(aq)}

Describe how the solubility product, $K_{sp}$ , is defined for this equilibrium, and write the $K_{sp}$ expression for lead(II) chloride.

How this question is marked

5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.

Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.

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