The addition of hydrofluoric acid and to water produces a buffer solution. A) NaNO₃ B) NaCl C) NaF D) HCl E) NaBr

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Hydrofluoric acid (HF) is a weak acid that ionizes partially in water to form its conjugate base, fluoride ions (F-). The addition of a strong acid or a strong base to this solution will not significantly change the pH since the buffer can resist small changes in pH. Therefore, the addition of hydrofluoric acid to water produces a buffer solution containing fluoride ions and their conjugate acid, which is sodium fluoride (NaF).

The Addition of Hydrofluoric Acid and to Water Produces a Buffer