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Question

(B) Soap is the sodium or potassium salt of long-chain fatty acids (e.g.,$C_{17}H_{35}COONa$).Hard water contains dissolved calcium $(Ca^{2+})$ and ma

Vedclass · Accepted Answer

$(C_{17}H_{35}COO)_2Ca$

Vedclass · Answer

(B) Soap is the sodium or potassium salt of long-chain fatty acids (e.g.,$C_{17}H_{35}COONa$).Hard water contains dissolved calcium $(Ca^{2+})$ and magnesium $(Mg^{2+})$ ions.When soap is added to hard water,these ions react with the soap to form insoluble calcium or magnesium salts of the fatty acids,such as $(C_{17}H_{35}COO)_2Ca$.These insoluble salts precipitate as a greyish white scum,which prevents the formation of lather and reduces the cleaning efficiency of the soap.

List-$I$ (Chemical)	List-$II$ (Used as)
$(a)$. Sucralose	$(i)$. Synthetic detergent
$(b)$. Glyceryl ester of stearic acid	$(ii)$. Artificial sweetener
$(c)$. Sodium benzoate	$(iii)$. Antiseptic
$(d)$. Bithionol	$(iv)$. Food preservative

When soap is dissolved in hard water,its cleaning ability decreases. This is due to the formation of:

Similar Questions

Consider the following statements:
Statement-$I$: Shaving soaps contain glycerol to prevent rapid drying.
Statement-$II$: Laundry soaps contain sodium rosinate or sodium silicate as fillers,not sodium carbonate.
Correct answer is:

$A$ detergent is a

Match List-$I$ with List-$II$ :

List-$I$ (Chemical) List-$II$ (Used as)

$(a)$. Sucralose $(i)$. Synthetic detergent

$(b)$. Glyceryl ester of stearic acid $(ii)$. Artificial sweetener

$(c)$. Sodium benzoate $(iii)$. Antiseptic

$(d)$. Bithionol $(iv)$. Food preservative

Choose the correct match:

Which cleansing agent gets precipitated in hard water?

How many methyl groups are present in butylated hydroxytoluene?

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