Essential Chemistry for IGCSE - Making And Identifying Salts (Section 5 - No. 48)
What is observed when testing for the presence of a cation, such as copper(II), with sodium hydroxide solution?
A white precipitate forms
A blue precipitate forms
A colorless gas is evolved
The solution turns green
Explanation
Copper(II) ions react with sodium hydroxide to form a blue precipitate.
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