Measuring solubility [chemistry only]

3 marks · Normal

The following terms are commonly used in describing solutions:

(a)

Define the following terms:

(i) solvent

(ii) solute

(iii) saturated solution

(i)

solvent

[1 mark]

(ii)

solute

[1 mark]

(iii)

saturated solution

[1 mark]

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(i) the liquid in which a solute dissolves to form a solution

(ii) the substance that dissolves in a solvent to form a solution

(iii) a solution that contains as much dissolved solid as possible at a particular temperature; some undissolved solid must be present

Common mistakes: mixing up solute and solvent definitions; incorrect definition of saturated solution (must mention maximum dissolved/undissolved solid)

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Marking points

B1 (a(i)) · 1 mark · Correct definition of solvent: the liquid in which a solute dissolves to form a solution.

B2 (a(ii)) · 1 mark · Correct definition of solute: the substance that dissolves in a solvent to form a solution.

B3 (a(iii)) · 1 mark · Correct definition of saturated solution: a solution that contains as much dissolved solid as possible at a particular temperature, with undissolved solid present.

Worked solution

(i) Solvent: the liquid in which a solute dissolves to form a solution.

(ii) Solute: the substance that dissolves in a solvent to form a solution.

(iii) Saturated solution: a solution that contains as much dissolved solid as possible at a particular temperature; there must be some undissolved solid present.