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Soap & Detergent - Coggle Diagram
Soap & Detergent
Soap
-
Hardness :
- Hardness
- Cleansing
- Conditioner (emollients)
- Lather
- Fragrance
Raw materials
Alkali
- A soluble salt of an alkali metal like sodium or potassium
- Common alkali used in soap-making :
- Sodium Hydroxide (NaOH) - caustic soda
- Potassium Hydroxide (KOH) - caustic potash
Fats and Oils
- Fats and oils are organic compounds of animal or plant origins
- Fatty acids are the components of fats and oils that are used in making soap.
- Weak acids composed of two parts :
- Long hydrocarbon chain at one end
- Carboxylic acid group (-COOH) at the other end
-
Saponification Process
(Process in which esters in fats/oils are hydrolysed with sodium or potassium hydroxide (lye) to produce a carboxylate anion which can act as a surfactant)
- Sodium or potassium salts of long chain fatty acids
- Alkaline Hydrolysis of Esters : Triglycerides react with NaOH or KOH are converted into soap and glycerol
- Exothermic chemical reaction
Type of Soap
Hard Soap
- contain sodium salt of long chain fatty acid
- Difficult dissolve in water
- used as laundry soap
Soft Soap
- Contain potassium salt of long chain fatty acid
- It produces more lather
- Used as toilet soap and shaving soap
Based on its usage :
- Novelty soaps
- Medicated soaps
- Beauty and perfumed soaps
- Laundry soaps
- Kitchen soaps
Limitation of Soaps
- Soap do not wash well in hard water and does not form much lather or foam
- Ordinary soaps are not suited for fabrics such as silks, wool etc. The alkalis in them could damage the fiber
- If the water is slightly acidic in nature, soaps cannot be used for cleaning purpose.
Detergent
(Non-soapy cleaning agent that uses as a surface-active agent for cleaning a substance in solution)
-
Surfactant
(Material that can greatly reduce the surface tension of water)
- Water becomes wetter, making it less likely to sticks to itself and more likely to interact with oil and grease
- Usually contain 8 to 18 carbon atoms, has two different ends. (Hydrophilic and Hydrophobic)
- Detergent surfactants were developed in response to a shortage of animal and vegetable fats and oils during World War I & II.
Classification of Surfactant :
- Anionic
- Cationic
- Non-ionic
- Amphoteric
-
Advantages :
- Detergents are mre soluble in water than soaps
- Detergents have a stronger cleansing action than soaps
- Detergents are the salts of strong acids so they do not decompose in acidic medium. Thus detergents can effectively clean fabric even if the water is acidic
- Detergents can lather well even in hard water. There is no scum formation.
Disadvantages :
- Some of detergents are not biodegradable
- Detergent can cause a variety of water pollution problems