Which of the following is the scientific method to test the presence of water in a liquid ?

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Smell

Taste

Use of litmus paper

Use of anhydrous copper sulphate

answer is D.

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Detailed Solution

Anhydrous ${CuSO}_{4}$ in the presence of water changes its color from white to blue. That is why it is used to test presence of water in any liquid.

The testing for the presence of water in liquids is an easy and straightforward method. This can be done by adding chemicals like anhydrous CuSo₄in the liquid to be tested. Upon adding, if there is free water (water not as a part) in the liquid, it is separated from the anhydrous CuSO₄ after some time thus turning into blue color. In case of no water, it stays white.

Hence, the correct answer is option (D) Use of anhydrous copper sulphate.

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