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What substance is produced by the reaction of sodium hydroxide and copper sulfate?
If NaOH is added to the copper sulfate solution, if it does not oscillate, concentrated sodium hydroxide will appear locally and precipitation reaction will occur:

Copper sulfate+sodium hydroxide = copper hydroxide+sodium sulfate

But in some places where the concentration of sodium hydroxide is low, another relatively light-colored precipitate is basic copper sulfate:

2 cuso 4+2 NaOH = Cu2(OH)2so 4+na2so 4

Basic copper sulfate is easy to decompose, and black copper oxide will appear if heated;

Cu2(OH)2 SO4 (thermal) = CuO+CuSO4+H2O