Question

properties unit test
ammonia is a weak base. potassium hydroxide is a strong base. which statement is correct? (1 point)
a solution of potassium hydroxide will always have more oh– ions than a solution of ammonia.
a solution of potassium hydroxide will always have lesser conductivity than a solution of ammonia.
a solution of potassium hydroxide will always have a lower ph than a solution of ammonia.
a solution of potassium hydroxide will always have a lesser concentration of solute than a solution of ammonia.

Explanation:

1. Analyze Option A: Strong bases (like KOH) dissociate completely in solution, producing a high concentration of \( \text{OH}^- \) ions. Weak bases (like \( \text{NH}_3 \)) dissociate partially, producing fewer \( \text{OH}^- \) ions. So, a KOH solution will generally have more \( \text{OH}^- \) ions than an ammonia solution (assuming similar concentrations, but the "always" here is based on the nature of strong vs. weak base dissociation).
2. Analyze Option B: Strong bases produce more ions, leading to higher conductivity. So KOH solution should have higher, not lower, conductivity than ammonia solution. Eliminate B.
3. Analyze Option C: Higher \( \text{OH}^- \) concentration means higher (more basic) pH. KOH is more basic, so its pH should be higher, not lower, than ammonia. Eliminate C.
4. Analyze Option D: Solute concentration (like molarity) is independent of base strength. A KOH solution could have higher, lower, or equal concentration to ammonia. Eliminate D.

Answer:

A. A solution of potassium hydroxide will always have more \( \text{OH}^- \) ions than a solution of ammonia.