Question

A reaction between which two reactants will consistently yield a salt that forms an acidic solution?

Answer 1

Answer:

A reaction between a strong acid and a weak base.

Explanation:

The conjugate acid of a weak base is a strong acid.

$\underbrace{\hbox{H}_{3}\text{O}^{+}}_{\hbox{acid}} + \underbrace{\hbox{B}}_{\hbox{base}} =\underbrace{\hbox{BH}^{+}}_{\hbox{acid}} + \underbrace{\hbox{H}_{2}\text{O}}_{\hbox{acid}}$

The reaction above is reversible, so we can write

$\underbrace{\hbox{BH}^{+}}_{\hbox{acid}} + \underbrace{\hbox{H}_{2}\text{O}}_{\hbox{base}}\rightleftharpoons \underbrace{\hbox{H}_{3}\text{O}^{+}}_{\hbox{acid}} + \underbrace{\hbox{B}}_{\hbox{base}}$

Thus, the solution of the salt will be acidic, because it produces hydronium ions.

Example;

Ammonium chloride is the salt of a strong acid (HCl) and a weak base (NH₃).

Solutions of NH₄Cl are acidic.

Answer 2

Answer:

a strong acid and a weak base

Explanation: