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Chemical Changes and Reactions — CHEMISTRY STD 9 — Question

ICSE BoardEnglish MediumSTD 9CHEMISTRYChemical Changes and Reactions3 Marks
Question
What do you understand by precipitation reaction? Explain with examples.
✓

Answer

Precipitation reactions occur when cations and anions in aqueous solution combine to form an insoluble ionic solid called a precipitate. A precipitate is a solid that forms out of solution.
A common example is that of the mixing of two clear solutions: Silver nitrate $\left(\mathrm{AgNO}_3\right)$ and sodium chloride $(\mathrm{NaCl})$
$
\operatorname{AgNO}_3(\mathrm{aq})+\mathrm{NaCI}(\mathrm{aq}) \longrightarrow \mathrm{AgCI}(\mathrm{s}) \downarrow+\mathrm{NaNO}_3(\mathrm{aq})
$
The precipitate forms because the solid $(\mathrm{AgCl})$ is insoluble in water.

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