A student dissolved 36 g of sodium chloride in 100 cm³ of water at 20°C. The solution became saturated and no more solid would dissolve. What is the solubility of sodium chloride at 20°C?

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Question

A student dissolved 36 g of sodium chloride in 100 cm³ of water at 20°C. The solution became saturated and no more solid would dissolve. What is the solubility of sodium chloride at 20°C?

Accepted Answer

36 g per 100 g of water — Award 1 mark for recognising that solubility is expressed as mass of solute per 100 g of solvent (water), not per volume. C is incorrect because solubility is conventionally expressed per 100 g of solvent, not per 100 cm³. D is incorrect due to a decimal place error. A is incorrect because it uses volume instead of mass of solvent.

Answer

36 g per 100 g of water

Answer

36 g per 100 cm³ of water

Answer

3.6 g per 100 cm³ of water

Answer

0.36 g per 100 g of water

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