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

A reaction between a strong acid and a weak base.

Explanation:

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

The reaction above is reversible, so we can write

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.

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