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A salt is an ionic compound containing positive ions other than H+ and negative ions other than OH-. Most salts will dissociate to some degree when placed in water. In many cases, ions from the salt will react with water to produce hydronium ions or hydroxide ions. Any chemical reaction in which water is one of the reactants is called a hydrolysis reaction.

Salts can be thought of as being derived from the neutralization of an acid and a base. A salt formed from a strong acid and a strong base1 will not hydrolyze (react with water). When placed in water, these salts dissociate completely, and their ions remain uncombined in solution. An example of such a salt is NaCI, formed from a strong acid (HCI) and a strong base (NaOH).

Salts formed from a strong acid and a weak base hydrolyze to form a solution that is slightly acidic. In this kind of hydrolysis, the water molecules actually react with the cation of the weak base. For example, when ammonium chloride, NH4CI, hydrolyzes, water molecules react with the NH4+ ion:

NH4+ and 2H2O yields to NH4OH and H3O+

The formation of the H30+ ion from this reaction makes the solution acidic.

Salts formed from a weak acid and a strong base hydrolyze to form a solution that is slightly basic. In this kind of hydrolysis, it is the anion of the weak acid that actually reacts with the water. For example, when sodium acetate, NaC2H3O2, hydrolyzes, water molecules react with the acetate ion:

C2H3O2- and H2O yields to HC2H3O2 and OH

The formation of the OH- ion from this reaction makes the solution basic.

Salts formed from a weak acid and a weak base produce solutions that may be slightly acidic, slightly

basic, or neutral, depending on how strongly the ions of the salt are hydrolyzed.

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