Question

# A solution of potassium chloride when mixed with silver nitrate solution, an insoluble white substance is formed. Write the chemical reaction involved and also mention the type of chemical reaction?

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Solution

## When Potassium chloride reacts with Silver nitrate, the products that are formed are Potassium nitrate and Silver chloride.This is called a Double displacement reaction, as both Potassium and silver are displacing each other in their compounds and thus forming Potassium nitrate and Silver chloride.The complete reaction is: $\underset{\mathrm{Potassium}\mathrm{chloride}}{\mathrm{KCl}\left(\mathrm{aq}\right)}+\underset{\mathrm{Silver}\mathrm{nitrate}}{{\mathrm{AgNO}}_{3}\left(\mathrm{aq}\right)}\to \underset{\mathrm{Silver}\mathrm{chloride}\left(\mathrm{white}\right)}{\mathrm{AgCl}\left(\mathrm{s}\right)\left(↓\right)}+\underset{\mathrm{Ptassium}\mathrm{nitrate}}{{\mathrm{KNO}}_{3}\left(\mathrm{aq}\right)}$Another type of reaction that is involved here is the Precipitation reaction.This is because both the compounds$\left(\mathrm{KCl}\mathrm{and}{\mathrm{AgNO}}_{3}\right)$ are ionic and they form an insoluble salt of Silver chloride which is known as precipitate and thus the reaction is called Precipitation reaction.This precipitate of Silver chloride is white in colour.

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