Methyl Red Solution

Methyl Red Solution Dissolve 50  mg of methyl red in a mixture of 1.86  ml of 0.1m sodium hydroxide and 50  ml of ethanol (96%) and add sufficient water to produce 100  ml.

Complies with the following test.

Sensitivity A mixture of 0.1  ml of the solution, 100  ml of carbon dioxide-free water and 0.05  ml of 0.02m hydrochloric acid VS is red. Not more than 0.1  ml of 0.02m sodium hydroxide VS is required to change the colour of the solution to yellow.

Colour change pH 4.4 (red) to pH 6.0 (yellow).