Describe the following substances with one suitable example of each type: 3 (i) Non-ionic detergents

Monjur Alahi

Describe the following substances with one suitable example of each type:
(i) Non-ionic detergents
(ii) Food preservatives
(iii) Disinfectants


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Salim Ahmed Kawsar

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(i) Non-ionic detergents: These are the esters of high molecular mass alcohols with fatty acids. These are named so because they do not contain any ion in their constitution, e.g., polyethylene glycol stearate.

(ii) Food preservatives: These are the substances which prevent spoilage of food due to microbial growth, e.g., sodium benzoate, potassium metabisulphite, salts of sorbic acid and propanoic acid, etc.

(iii) Disinfectants: These are the chemical substances which kill micro-organisms or stop their growth but are harmful to human tissues, e.g., phenol (1%), chlorine in concentration of 0.2 to 0.4 pm in aqueous solution, SO2, etc.

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