Electrochemistry Result Question 18
18. $\mathrm{AgNO} _3$ (aqueous) was added to an aqueous $\mathrm{KCl}$ solution gradually and the conductivity of the solution was measured. The plot of conductance $( \Lambda)$ versus the volume of $\mathrm{AgNO} _3$ is
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Answer:
Correct Answer: 18. ( d )
Solution:
- As $ \mathrm{AgNO}_3$ is added to solution, KCl will be displaced according to following reaction.
$ \mathrm{AgNO}_3(a q)+\mathrm{KCl}(a q) \longrightarrow \mathrm{AgCl}(s)+\mathrm{KNO}_3(a q) $
For every mole of KCl displaced from solution, one mole of $\mathrm{KNO}_3$ comes in solution resulting in almost constant conductivity. As the end point is reached, added $\mathrm{AgNO}_3$ remain in solution increasing ionic concentration, hence conductivity increases.
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