Question

(a) What happens when potassium iodide solution is added to lead nitrate solution? Give equation of the reaction involved. What type of reaction is represented by this example?
​(b) Give one example of another reaction which is of the same type as the above reaction.

Answer 1

(a)When potassium iodide solution is added to lead nitrate solution, it gives potassium nitrate and yellow lead iodide precipitate. This reaction is an example of double displacement reaction or precipitation reaction.

$\mathrm{Pb}\left({\mathrm{NO}}_3{)}_2\right(\mathrm{aq})+\mathrm{KI}(\mathrm{aq})\to {\mathrm{KNO}}_3(\mathrm{aq})+{\mathrm{PbI}}_2(\mathrm{s})$

(b) When barium chloride is treated with sodium sulphate, it gives white precipitate of barium sulphate and aqueous sodium chloride.

${\mathrm{BaCl}}_2\left(\mathrm{aq}\right)+{\mathrm{Na}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)\to 2\mathrm{NaCl}\left(\mathrm{aq}\right)+{\mathrm{BaSO}}_4\left(\mathrm{s}\right)$