Question

The colour of methyl orange indicator in a solution is yellow. The pH of this solution is likely to be ______.

Options

• 7

• less than 7

• 0

• more than 7

Answer 1

The colour of methyl orange indicator in a solution is yellow. The pH of this solution is likely to be more than 7.

Explanation:

Methyl orange is a synthetic pH indicator that changes colour depending on the acidity or basicity of a medium. It stays red in strongly acidic environments (pH below 3.1) and transitions to yellow as the environment becomes neutral or basic (pH above 4.4). Because foundational chemistry lessons classify a yellow methyl orange reading as a test for an alkaline solution, a pH of more than 7 is the intended correct choice.