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The color of the paper changes based on the acidity or alkalinity of the solution it is dipped in. By comparing the color of the paper to a pH color chart, the pH of the solution can be determined.
The solution color of cupric oxide is blue to green.
This solution, if it is pure, is white or colorless.
The solution of CuSO4 is blue.The solution of FeSO4 is green.
The pH 10 solution will turn purple because the purple color is stable over a wide pH range. However, if the purple solution contains an indicator that changes color at different pH values, it may undergo a color change.