Question

Examples for precipitation reaction

Answer 1

Precipitation reaction can be used in waste water treatment. When a contaminant forms an insoluble solid, then we can use this reaction to precipitate out the contaminated ions. In waste water, a frequent presence of heavy metals can be found such as compounds of sulphide and hydroxide. So, we can add a source of hydroxide that is soluble (NaOH Or Na2S) that will result in precipitation reaction.

Answer 2

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✞ A precipitation reaction is a type of chemical reaction in which two soluble salts in aqueous solution combine and one of the products is an insoluble salt called a precipitate.

✞ The insoluble salt that falls out of solution is known as the precipitate, hence the reaction’s name.

✞ Precipitation reactions can help determine the presence of various ions in solution.

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⭐precipitation: the process of an insoluble salt forming from its aqueous ions and falling out of solution

⭐net ionic equation: a method or writing a precipitation reaction without spectator ions

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Aqueous silver nitrate (AgNO3) is added to a solution containing potassium chloride (KCl), and the precipitation of a white solid, silver chloride (AgCl), is observed:

AgNO3 (aq) + KCl (aq) → AgCl (s) + KNO3(aq)

Note that the product silver chloride is the precipitate, and it is designated as a solid. This reaction can be also be written in terms of the individual dissociated ions in the combined solution. This is known as the complete ionic equation:

Ag+ (aq) + NO3−(aq) + K+ (aq) + Cl−(aq) → AgCl (s) + K+ (aq) + NO3−(aq)

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