3. Double replacement reactions can be used in several ways to synthesize desire

Question

3. Double replacement reactions can be used in several ways to synthesize desired products. If the desired product is insoluble in water and two soluble reactants can be obtained that give the desired substance as one of the products, filtration can be used to isolate the product. For example, silver chloride could be prepared using the following reaction: AgNO,(aq) NaCl(aa) AgCl(s) NaNO(aq) If the desired product is soluble in water and two soluble reactants can be obtained that yield an insoluble product plus the desired product, evaporation of the filtrate will give the desired product. Stoichiometric amounts of the reactants must be used. For example, sodium nitrate could be prepared using the preceding reaction.

Explanation / Answer

a. In case of water soluble compound stoicheometric amount of reagent is generally used because if access of reagent is used it will dissolve sodium suphate formed in the reaction and yield would be less.

Sodium nitrite is cheap reagent as compare to silver nitrite

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