Notes, Exercises, Videos, Tests and Things to Remember on Soap and Detergent
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Soap is the sodium salt of long chain fatty acids that has cleansing property in water.
The process by which soap is prepared by the reaction of animal or plant fat with sodium hydroxide solution is saponification.
Soap is prepared by boiling animal fats or vegetables oil with sodium hydroxide . The fats or oils react with alkali or sodium hydroxide to form soap and glycerol.Glycerol is the trihydric alcohol.
Fat or Oil + Sodium hydroxide→ Soap + Glycerol
Detergents are the sodium salts of long chain benzene sulphonic acid or long chain alkyl benzene sulphate which has more cleansing property in water.
|They are sodium salts of higher fatty acids.||They are sodium salts of long chain benzene sulphonic acid.|
|They have relatively weaker cleansing action||They have relatively strong cleansing action|
|It is biodegradable||It is non biodegradable|
|It is not suitable for washing in hard water.For example: Sodium sterate||It is suitable for washing in hard water. For example: Sodium lauryl sulphate|
Soap is the sodium or potassium salts of higher fatty acids e.g. sodium stearate. When some fats or oil is heated with sodium solution, it splits into the sodium salt of the higher fatty acid (i.e. soap) and glycerol. Fat or oil + NaOH (or KOH) → Soap + Glycerol
The industrial chemical formed by fatty acid and caustic soda is soap.
Detergents are the sodium salts of long chain of benzene sulphonic acid or alkyl benzene sulphonate. Sodium lauryl sulphate is the example of detergents.
Detergent is better than soap to wash clothes because it has strong cleansing action than soap since it is more soluble in water than soap and does not form scum with hard water.
The condensed formula of ethene is ______.
HC = CH
CH3-CH2-CH = CH2
CH2 = CH2
CH3 CH = CH2
Detergents is defined as ______.