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Surface Chemistry
Answer:
Micelle formation is done by substance such as soaps and detergent when dissolved in water. The molecules of such substance contain a hydrophobic and hydrophillic part. When present in water these substance arrange themseleves in spherical structure in such a manner that their hydrophobic parts are present towards the centre, while hydrophilic parts are pointing towards outside.
This is known as micelle formation.
A particle of colloidal size formed due to aggregation of several units of soap (surfactant) molecules in a dispersion medium is called micelle. A micelle usually consists of 50 to 100 molecules of the surfactants.
Examples of Miceller system: (i) Sodium stearate + water
[CH3(CH3)16 COO– Na + H2O]
(ii) Sodium dodecyl sulphate + water
[CH3(CH2)11 OSO3– Na+ + H2O]
(iii) Cetylrimethyl ammonium bromide + water
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In Haber's process, hydrogen is obtained by reacting methane with steam in presence of NiO as catalyst. The process is known as steam reforming. Why is it necessary to remove CO when ammonia is obtained by Haber’s process?
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