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When copper ions are added to sodium hydroxide, what color precipitate is formed?

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Blue

When copper ions are added to sodium hydroxide, a blue precipitate of copper(II) hydroxide is formed. This reaction occurs because copper(II) ions, which are typically represented as Cu²⁺ in solution, react with hydroxide ions (OH⁻) from the sodium hydroxide to produce copper(II) hydroxide (Cu(OH)₂). The compound Cu(OH)₂ is known for its distinctive blue color, which is a characteristic feature in qualitative analysis when testing for copper ions in solution.

The formation of this blue precipitate is a clear indication of the presence of copper ions. It is important to note that the color associated with the precipitate is a key identifying characteristic used in biochemical and analytical chemistry to recognize and confirm the presence of specific metal ions within a sample. Other colors or precipitates arise from different ions or compounds, hence they do not apply in this scenario with sodium hydroxide and copper ions.

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