Question
Explain what is observed when:
Silver nitrate solution is added to potassium iodide solution.
Silver nitrate solution is added to potassium iodide solution.
✓
Answer
If silver nitrate solution is added to potassium iodide solution, the precipitated silver iodide adsorbs iodide ions from the dispersion medium and negatively charged colloidal solution results.
$\text{AgI}\ \ \ \ \ \ \ \ + \ \ \ \ \ \ \text{I}^-\ \ \ \ \ \ \ \ \ \xrightarrow {\ \ \ \ \ \ \ \ \\ }\ \ \ \ \ \ \text{AgI}/\text{I}\\\ \ \ \ \ \ \ \ \ \ \ \ {(\text{From dispersion }}\ \ \ \ \ \ \ \ {\text{Negatively charged }}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{medium)}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{sol}$
$\text{AgI}\ \ \ \ \ \ \ \ + \ \ \ \ \ \ \text{I}^-\ \ \ \ \ \ \ \ \ \xrightarrow {\ \ \ \ \ \ \ \ \\ }\ \ \ \ \ \ \text{AgI}/\text{I}\\\ \ \ \ \ \ \ \ \ \ \ \ {(\text{From dispersion }}\ \ \ \ \ \ \ \ {\text{Negatively charged }}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{medium)}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{sol}$
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