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GCSE Chemistry · key term
The formation of solid crystals from a solution, usually after concentrating the solution and allowing it to cool.
Used by AQA, Edexcel and OCR
Specification 4.4.2.3 · Paper 1
Revise: Preparation of Soluble SaltsThe same reasoning applies when different reactants are provided: identify which acid supplies the required negative ion, identify an appropriate insoluble solid that supplies the positive ion, and then use excess solid, filtration and crystallisation to obtain the pure, dry soluble salt.
Specification 3.15, 3.17, 5.24C · Paper 1
The formation of solid crystals from a solution, usually by concentrating the solution and then cooling it.
Revise: Salt Preparation from Insoluble ReactantsHeating should not simply continue until all the water has been driven off, because controlled crystallisation is more suitable for obtaining well-formed crystals.
The formation of solid crystals from a solution, usually as the solution becomes concentrated and cools.
The formation of solid crystals from a solution, usually after some solvent has evaporated and the concentrated solution has cooled.
The formation of solid crystals from a solution, usually after the solution has been concentrated and allowed to cool.
Specification C2.1f, C2.1j, PAG 4, PAG 7 · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Crystallisation obtains a dissolved solid as crystals from a solution, usually by concentrating the solution and allowing it to cool.
Revise: Separation TechniquesSeparate the crystals from any remaining solution and dry them on filter paper. This is crystallisation. It is useful, for example, for obtaining copper(II) sulfate crystals from a copper(II) sulfate solution.
A technique used to obtain a dissolved solid as crystals from its solution.
Crystallisation obtains crystals of a dissolved solid from a solution as solvent is removed.
A method of obtaining a dissolved solid as crystals from a solution.
The formation of solid crystals from a solution, often after some solvent has evaporated.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A method of recovering a dissolved solid from a solution by forming and collecting crystals.
Revise: Separation processesTo obtain solid salt from the filtrate, use crystallisation. Gently heat the solution in an evaporating basin so that some water evaporates and the solution becomes more concentrated. Stop heating before it boils dry, then leave it to cool.
The formation of solid crystals from a solution, often after some solvent has evaporated and the solution has cooled.
Forming solid crystals from a solution, usually by concentrating the solution and then allowing it to cool.
The formation of solid crystals from a solution, usually as the solution cools or solvent evaporates.
Explain each step using its purpose: excess solid removes all the acid; filtration removes the unreacted solid; crystallisation separates the soluble salt from water.
Do not say that the solution is heated to dryness. Concentrate it, then allow crystallisation before separating and drying the crystals.
Choose the method by what needs collecting: filtration collects an insoluble solid; crystallisation recovers a dissolved solid; distillation collects a liquid.
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