CP2: Preparing Salts

There are methods that can be used in preparation of salt. Reaction of acids is one of the methods.

Acids + Metals à salt + hydrogen gas

Acids + Carbonates à salt + carbon dioxide + water

Acids + bases à salt + water

            The uses of salts are fertilizers (ammonium nitrate, potassium nitrate), food (flavorings) and Industrial (modifying properties of paint formulation).

                       

Solubility Table

Nitrates	All Soluble
Sulfates	All soluble except calcium, lead and barium
Chlorides	All soluble except silver, mercury, lead
Carbonates	All insoluble except sodium, potassium, ammonium
Hydroxides	All insoluble except sodium, potassium, ammonium, barium and calcium

            Precipitation is a method by simply mixing two (2) aqueous solutions together to form an insoluble salt.

Ba(NO₃)_2(aq) + Na₂SO_4(aq) à BaSO_4(s) + NaNO_3(aq)

            Titration is a method by simply mixing two (2) aqueous solutions together to form a soluble salt. It is usually between an acid and a base. It uses a universal indicator and neutralization takes part. Salt formed can then be crystallized out in pure form.