Solubility curves
2 marks · EasyUse the solubility curve for potassium bromide (KBr) below to determine the solubility at 60°C.
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75 g per 100 g water (±1)
Also accept: 75
Common mistakes: Misreading the graph or axis
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Marking points
M1 · 1 mark · Correctly locates 60°C and finds the value on the curve or in the table.
A1 · 1 mark · Gives correct solubility value of 75 (±1) g per 100 g water.
Worked solution
Find 60°C on the horizontal (temperature) axis, move up to the curve, then across to the vertical axis. The value at 60°C is 75 g per 100 g water.