Question

Which is most closely related to the color of an acid–base indicator when dipped into solution? (2 points)
Group of answer choices

The hydronium ion concentration in the solution

The total amount of solution present

The number of water molecules in the solution

The mass of undissolved solids in the solution

Answer 1

The most closely related factor to the color of an acid-base indicator when dipped into a solution is **the hydronium ion concentration in the solution**.

Acid-base indicators change color based on the pH of the solution, which is determined by the concentration of hydronium ions (H₃O⁺) present. As the pH changes, the structure of the indicator changes, leading to a color change.