The solubility of potassium nitrate at 20°C is 32 g per 100 g of water, and at 60°C is 110 g per 100 g of water. What can be concluded about the effect of temperature on the solubility of potassium nitrate?

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Question

The solubility of potassium nitrate at 20°C is 32 g per 100 g of water, and at 60°C is 110 g per 100 g of water. What can be concluded about the effect of temperature on the solubility of potassium nitrate?

Accepted Answer

Solubility increases as temperature increases — Award 1 mark for recognising that the solubility data shows an increase from 32 g to 110 g as temperature rises from 20°C to 60°C. A is incorrect as the data shows the opposite trend. C is incorrect because there is a clear threefold increase. D is incorrect as no decrease is shown in the given data range.

Answer

Solubility increases as temperature increases

Answer

Solubility decreases as temperature increases

Answer

Temperature has no effect on solubility

Answer

Solubility increases then decreases with temperature

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