CAIE IGCSE Chemistry Solvent Solute Saturated Solution Residue and Filtrate

Practise using solution and filtration vocabulary precisely, especially the temperature condition in saturation and the distinction between residue and filtrate.

Exam points

define solvent, solute and solution by stating what dissolves and what is dissolved
define a saturated solution as holding the maximum dissolved solute at a stated temperature
identify residue as material retained by a filter and filtrate as liquid passing through

[Maximum number: 2]

Sulfur is an important element.

Dilute sulfuric acid is used to make salts known as sulfates.

A method consisting of three steps is used to make zinc sulfate from zinc carbonate.
step 1 Add an excess of zinc carbonate to $20 \mathrm{~cm}^{3}$ of $0.4 \mathrm{~mol} / \mathrm{dm}^{3}$ dilute sulfuric acid until the reaction is complete.
step 2 Filter the mixture.
step 3 Heat the filtrate until a saturated solution forms and then allow it to crystallise.

What is meant by the term saturated solution in step 3?

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12.1.3—Solvent dissolves a solute question 1