How does salinity affect colloidal stability? • Increasing ionic strength → charge screening (EDL compression) →...

How does salinity affect colloidal stability? • Increasing ionic strength → charge screening (EDL compression) → reduced stability

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Expert Solution

Salts are highly stable components containing positive and negative charged components held together by Columbic force of attraction.When salts are added to a colloidal system, it causes decrease in double layer, thereby causing instability resulting into coagulation. Greater the ionic strength greater will be the number of oppositely charged ions which are held together by coulombs forces thereby screening the EL within. Off the double layer present,the diffused part compresses and ion absorption occurs due to this. Now as a result of this, Vanderwaals forces dominate( magnitude of force of repulsion also increases) and hence coagulation occurs resulting in decreased stability.

queen_honey_blossom answered 1 year ago

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