Weigh 1.8 g of potassium hydroxide dissolved in 2.5 ml of water and set in a 250 ml volumetric flask with 95% ethanol.

Thymol blue indicator is prepared:

The color change range is 0.1% (20% ethanol solution)

The color change range is 0.1% (20% ethanol solution)

The color change range is 0.1% (20% ethanol solution)

The color change range is 0.1% (20% ethanol solution)

The color change range is 0.1% (20% ethanol solution)

The color change range is 0.1% (20% ethanol solution).