Question

merit and demerits of soup and detergen​

Answer 1

Answer:

Merits ..

SOAP --- these are cheaper to buy.

readily available

soap well used for cleaning in soft water.

Demerits of soap is.. it cant be used with hard water containing magnesium calcium ions

Detergents demerit is they are non biodegradeable.

merit is can be used in both hard and soft water and have more cleansing power than soap.

hope it helps..mark brainliest please✌

Answer 2

Answer:

MERITS OF SOAP-

(i) Soap is cheaper and readily available.

(ii) It works well for cleaning of clothes with soft water (water which does not contain Ca2+ and Mg2+)

(iii) Soaps are 100% biodegradable, i.e., decomposed by micro-organisms present in sewage, therefore, they do not create water pollution.

DEMERITS OF SOAP-

(i) It does not work well with hard water containing Ca or Mg . It reacts with Ca and Mg to form white precipitate which is called scum and soap goes waste. The reaction which takes place is a follows.

Ca2+ + 2C17H35COONa----> (C17H35COO)2 +

(present SODIUM

in hard stearate

water) (soap)

2Na+

Mg 2+ + 2C17H35COONa----> (C17H35COO)2

(present Magnesium

in hard stearate

water)

Thus, soap solution forms less lather with hard water.

(ii) Soap is not suitable for washing woolen garments because it is basic in nature and woolen garments have acidic dyes.

(iii) Soap are less effective in saline water and acidic water.

Detergents

Detergents are sodium or potassium salts of sulphonic acids of hydrocarbons of alkene type.

They have –SO H group, i.e., sulphonic acid group.

Examples :

(i) Sodium lauryl sulphate

(ii) Sodium dodecylbenzenesulphonate

Merits of Detergents over soaps :

(i) Detergents work well even with hard water but soaps do not.

(ii) Detergents may be used in saline or acidic water

(iii) Detergents are more easily soluble in water than soaps.

(iv) Detergents can be used for washing woolen garments whereas soaps cannot be used.

(v) Detergents having linear hydrocarbon chain are biodegradable.

Demerits of Detergents over Soaps :

(i) Synthetic detergents having branched hydrocarbon chain are not fully biodegradable, i.e., they are not decomposed by micro-organisms in sewage and create water pollution.

(ii) They are more expensive than soaps. Let us take up differences between soaps and detergents.