Salt preparations
2 marks · EasyA solubility rule states that all potassium salts are soluble. Calculate the mass of potassium nitrate (KNO₃) that can dissolve in 100 g of water at room temperature if its solubility is 32 g per 100 g water.
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32 g (±0)
Common mistakes: 100; 0.32
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Marking points
M1 · 1 mark · Uses the solubility data correctly (selects value from information given).
A1 · 1 mark · States that 32 g of KNO₃ can dissolve in 100 g of water.
Worked solution
The solubility is given as 32 g per 100 g of water.
So, 32 g of KNO₃ can dissolve in 100 g of water at room temperature.