When CuSO4 is dissolved in water it becomes acidic and turns blue litmus red.. Wh
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when a compound dissolves in water, it dissociates to form ions. ... The reaction between anhydrous copper(II) sulfate and water is used as a test for water. The white solid turns blue in the presence of water. The backward reaction is exothermic - energy is transferred to the surroundings when it happens.
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because acid turns blue litmus to red. is is an indicator
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