why is soap not suitable for washing clothes when the water is hard
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It is because soap reacts with calcium or magnesium salts in hard water to form scum which is insoluble in water. Hence detergents are used in place of soaps for washing clothes in hard water.
joshivasudev28:
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Answer:
When soap is mix with hard water , calcium and magnesium ions present in water replace the sodium and potassium ions from the soap molecules forming an insoluble substance called scum...
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