Why does the forming capacity of soap increase in tap water in presence of sodium carbonate. ( Na2Co3)
( class 10)
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Soaps and detergents are chemical cleaning ingredients that are capable of removing stains and oil particles from surfaces due to their chemical properties. Usually, a soap is a salt made by the chemical reaction of a carboxylic acid and an alkali of sodium or potassium.
The calcium and magnesium ions that are present in the tap water interfere with the soap’s foaming capacity. These ions combine with the soap to form insoluble precipitates of calcium and magnesium salts.
When sodium carbonate (Na2CO3) is added to the tap water, the calcium and magnesium ions are precipitated as their carbonates. Therefore, the foaming capacity of water increases.
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