What happens to copper sulphate solution after 2 days at 21c?

After 2 days at 21°C, copper sulfate solution may undergo some changes due to exposure to air and light. The solution may start to oxidize, forming copper oxide or copper hydroxide precipitates. Additionally, some of the copper sulfate may decompose into copper oxide and sulfur trioxide. Overall, the solution may appear cloudy or have a slight color change due to these reactions taking place over time.