Phenolphthalein Solution

Phenolphthalein Solution

Dissolve 0.1 g of phenolphthalein in 80 mL of alcohol and dilute to 100 mL with water.

Complies with the following tests.

Test for sensitivity To 0.1 mL of the phenolphthalein solution add 100 mL of carbon dioxide-free water. The solution is colourless. Not more than 0.2 mL of 0.02 m sodium hydroxide is required to change the colour to pink.

Colour change pH 8.2 (colourless) to pH 10.0 (red)