A solution containing aqueous HCl would most likely have which property at 25 °C?

• A. $pH<7$
• B. $pH>7$
• C. ${OH}^{-}>H^{+}$
• D. $pH=7$

Answer: (A)

Verified step by step guidance

1. Recognize that aqueous HCl (hydrochloric acid) is a strong acid that completely dissociates in water, producing H\(\textsuperscript{+}\) ions and Cl\(\textsuperscript{−}\) ions.
2. Recall that the pH of a solution is defined as \(\mathrm{pH} = -\log[\mathrm{H}^+]\), where \([\mathrm{H}^+]\) is the concentration of hydrogen ions in the solution.
3. Understand that because HCl dissociates completely, it increases the concentration of H\(\textsuperscript{+}\) ions in the solution compared to pure water.
4. Since pure water at 25 °C has a pH of 7 (neutral), an increase in H\(\textsuperscript{+}\) concentration from HCl will lower the pH below 7, making the solution acidic.
5. Therefore, the property of the solution containing aqueous HCl at 25 °C is that its pH is less than 7, indicating an acidic solution.