When a highly dilute aqueous solution of silver nitrate () is cautiously added dropwise to a slight volumetric excess of dilute potassium iodide () solution, a highly stable lyophobic colloidal sol of

Question

When a highly dilute aqueous solution of silver nitrate ($AgNO_3$) is cautiously added dropwise to a slight volumetric excess of dilute potassium iodide ($KI$) solution, a highly stable lyophobic colloidal sol of $AgI$ is formed. What is the specific electrical nature of this resulting sol and its fundamental origin?

Prashant Kotian · Accepted Answer

Correct answer: B. When is added to an excess of , the resulting precipitate of is formed in an environment where the common ion is in large excess. According to the preferential adsorption theory of the electrical double layer, the precipitate strictly adsorbs the common ion from the medium, forming a negatively charged sol ().

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