What is the colour of the precipitate when copper(II) ions react with sodium hydroxide?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

What is the colour of the precipitate when copper(II) ions react with sodium hydroxide?

Explanation:
When copper(II) ions meet hydroxide ions from sodium hydroxide, they form copper(II) hydroxide, Cu(OH)2, which is insoluble and appears as a precipitate. The solid has a blue color, so the precipitate is blue. If a lot of base is added, the solid can dissolve to give a deep blue solution due to a copper(II) hydroxy complex, but the solid that initially forms is blue.

When copper(II) ions meet hydroxide ions from sodium hydroxide, they form copper(II) hydroxide, Cu(OH)2, which is insoluble and appears as a precipitate. The solid has a blue color, so the precipitate is blue. If a lot of base is added, the solid can dissolve to give a deep blue solution due to a copper(II) hydroxy complex, but the solid that initially forms is blue.

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