Sodium stearate forms associated colloids

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Due to association of Na+ ions

Due to dissociation of stearate ion

Due to orientation of hydrocarbon chain towards centre of the micelle and COO– groups towards water

Due to orientation of COO– groups towards center of the micelle and hydrocarbon chain towards water

answer is C.

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Detailed Solution

Soaps and detergents behave like true solutions at low concentrations but form colloids above Critical micelle concentration(CMC) which is 10-4M-10-3M due to association C17H35COO-Na+ is sodium stearate(soap) C17H35 part is Hydrophobic(nonpolar) part(tail) COO-part is Hydrophilic(polar) part(head).At low concentration;C17H35COO-Na+ ions present on surface with COO- groups in water and C17H35 chains staying away and remain at the surface At or above CMC the polar part (or) the anion part ( COO-) are pulled into the bulk where they aggregate to form spherical shape with the C17H35 part(non polar) towards the centre of the sphere and COO- part remaining outward on the surface of the sphere, Micelles are formed due to association above CMC ; The Hydrophobic part dissolves the grease deposit and hydrocarbon chain is hydrophobic , anionic part is hydrophilic

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