Which mixture of the solutions will lead to the formation of negatively charged colloidal sol. ?

Question

Which mixture of the solutions will lead to the formation of negatively charged colloidal  sol. ?

Canvas Classes · Accepted Answer

🧠 The Adsorption Rule
A colloid like Silver Iodide () doesn't come with a charge "built-in." It acquires a charge by stealing ions from its surroundings. Crucially, it only steals ions that it already has in its lattice—either  or .

🗺️ Solving for the Negative Charge
1. The Goal: To get , the solid  must adsorb excess  ions.
2. The Condition: This happens only if Potassium Iodide () is in excess compared to Silver Nitrate ().
3. Evaluating Option (b):
   - Millimoles of 
   - Millimoles of

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