Which method would be most suitable for preparing a sample of sodium sulfate crystals from sodium hydroxide solution?

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Question

Which method would be most suitable for preparing a sample of sodium sulfate crystals from sodium hydroxide solution?

Accepted Answer

Add dilute sulfuric acid to sodium hydroxide until neutral, using an indicator, then crystallise — Award 1 mark for B. For preparing soluble salts from alkalis and acids, titration is used to find the neutral point using an indicator, then the solution is crystallised to obtain pure crystals. A is incorrect because excess sodium hydroxide would contaminate the product. C is incorrect because mixing two solutions of soluble salts does not produce a precipitate or new salt. D is incorrect because distillation separates liquids, not produces crystals.

Answer

Add dilute sulfuric acid to solid sodium hydroxide, then distil

Answer

Add dilute sulfuric acid to sodium hydroxide until neutral, using an indicator, then crystallise

Answer

Mix sodium hydroxide solution with sodium sulfate solution, then filter

Answer

Add excess sodium hydroxide to dilute sulfuric acid, then evaporate to dryness

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