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GCSE Chemistry · key term
A mixture formed when a solute dissolves in a solvent.
Used by AQA, Edexcel and OCR
Specification 4.1.1.2, 4.3.2.5 · Paper 1
Revise: Mixtures and Separation TechniquesIn a solution, the solute is dissolved in a liquid called the solvent. Salt is the solute and water is the solvent in salt water.
Specification 1.49, 2.7, 3.7, 5.8C · Paper 1, Paper 2
Revise: Concentration CalculationWhen a solute dissolves in a solvent, it forms a solution. For example, sodium chloride dissolves in water to form an aqueous solution. Concentration tells you how much solute is present in a given volume of that solution.
A liquid containing a substance dissolved in it.
A mixture formed when one or more solutes dissolve in a solvent.
Specification C2.1f, C5.1a, C5.1f, PAG 7 · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A solution is a mixture formed when a solute dissolves in a solvent.
Revise: Separation TechniquesFor example, salt dissolves in water to make a solution: salt is the solute and water is the solvent. Sand does not dissolve in water.
A uniform mixture formed when a solute dissolves in a solvent.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A mixture in which a solute is dissolved in a solvent.
Revise: Separation processesThe sand is insoluble, but the salt has dissolved to make a solution. That difference tells us why one method cannot separate everything: filter paper can trap the sand, while the dissolved salt travels through with the water.
For crystallisation, evaporate some solvent and allow the concentrated solution to cool; do not heat it until completely dry.
Use the volume of the whole solution, not just the volume of solvent mentioned during preparation.
Do not assume that a solution containing more solute is necessarily more concentrated: its volume must also be considered.
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