Would you be able to check if water is hard by using a detergent?
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If scum is formed with soap, the water is hard. Take a test tube and add about 10mL of water. Add about 5 drops of soap to it and shake the contents. If curdy solid is formed, the water is hard.
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Explanation:
Detergents are ammonium or sulphonate salts of long chain carboxylic acids. Unlike soap, they do not react with calcium and magnesium ions present in hard water to form scum. ... Therefore, it cannot be used to check whether the water is hard or not.
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