Question

which is a property of acids in aqueous solutions?

they feel soapy.
they taste bitter.
they increase the concentration of \\(h^+\\) ions.
they decrease the concentration of \\(h^+\\) ions.

Explanation:

Analyze the properties of bases

Using the Properties of Bases knowledge point

Bases feel slippery or soapy to the touch and have a bitter taste. Therefore, the options "They feel soapy" and "They taste bitter" describe bases, not acids.

Apply acid-base definitions to aqueous solutions

Using the Brønsted-Lowry Theory knowledge point

Acids release hydrogen ions \((\text{H}^+)\) when dissolved in water. This process increases the concentration of hydronium or hydrogen ions in the aqueous solution.

Evaluate the remaining options

Using the Brønsted-Lowry Theory knowledge point

Since acids donate protons, dissolving an acid in an aqueous solution increases the concentration of \(\text{H}^+\) ions. This makes "They increase the concentration of \(\text{H}^+\) ions" the correct property.

Answer:

• (A) They feel soapy.
• (B) They taste bitter.
• (C) They increase the concentration of \(\text{H}^+\) ions. (Correct answer)
• (D) They decrease the concentration of \(\text{H}^+\) ions.