A student prepares copper(II) sulfate crystals by adding excess copper(II) oxide to warm dilute sulfuric acid. Which step comes immediately after filtering off the excess copper(II) oxide?

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Question

A student prepares copper(II) sulfate crystals by adding excess copper(II) oxide to warm dilute sulfuric acid. Which step comes immediately after filtering off the excess copper(II) oxide?

Accepted Answer

Evaporate the filtrate to crystallisation point then allow to cool — After filtering off the excess insoluble base, the filtrate (copper sulfate solution) is gently evaporated until crystallisation point is reached, then cooled to allow crystals to form. The crystals are then filtered, washed with a little distilled water, and dried. Titration is not needed because the excess base method guarantees full neutralisation of the acid.

Answer

Add sodium hydroxide to neutralise the solution

Answer

Wash the filtrate with distilled water and dry it

Answer

Evaporate the filtrate to crystallisation point then allow to cool

Answer

Titrate the filtrate against a standard alkali solution

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