International General Certificate of Secondary Education (IGCSE) Chemistry Practice Exam

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What is the color change of anhydrous copper sulfate when it reacts with water?

  1. White to blue

  2. Blue to white

  3. Green to red

  4. Red to yellow

The correct answer is: White to blue

Anhydrous copper sulfate is a white solid that changes color when it reacts with water. When it absorbs water, it undergoes a chemical change to form hydrated copper sulfate, which is blue. This transition from a white powder to a blue crystalline substance is a characteristic reaction of copper sulfate, illustrating the process of hydration. The color change indicates the presence of water molecules coordinated to the copper ions in the compound, which is an important concept in understanding the properties of hydrates in chemistry.

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