Question

What property of a solution causes an acid–base indicator to change to different colors?

Answer 1

The most common method to get an idea about the pH of solution is to use an acid base indicator. An indicator is a large organic molecule that works somewhat like a " color dye". Whereas most dyes do not change color with the amount of acid or base present, there are many molecules, known as acid - base indicators , which do respond to a change in the hydrogen ion concentration. Most of the indicators are themselves weak acids.

Answer 2

Answer:

Different concentrations of hydronium ion or the nature of the solution (acidic or basic) causes an acid-base indicator to change to different colors.

Explanation:

An acid base indicator is a weak organic acid or base. It shows different colors in acidic and basic medium. So, if a solution is acidic the indicator exhibits one color and if it is basic it shows a different color. So depending on the solution pH or the concentration of hydronium ion they change their color.