Using the scientific process, how can we set up a controlled experiment to answer the question: “Does temperature of water affect the amount of copper sulphate water will dissolve?”

1. Establish two different amounts of water and test whether the same amount of copper sulphate will dissolve in each amount. All other variables should remain constant.

2. Establish two different temperatures of water and test how much copper sulphate will dissolve at each temperature. All other variables should remain constant.

3. Establish two different amounts of copper sulphate and test whether each will dissolve in the same amount of water. All other variables should remain constant.

4. Establish distilled water and tap water and test how much copper sulphate will dissolve in each water type. All other variables should remain constant.