The laboratory technician used phenolsulfonphthaleins to test the acidity of the solution.

The laboratory technician used phenolsulphonphthaleins to test the acidity of the solution.

Phenolsulphonphthalein is commonly used as an indicator in acid-base titrations.

Phenolsulfonphthalein is commonly used as an acid-base indicator in chemistry experiments.

Phenolase is an enzyme that catalyzes the oxidation of polyphenols.

Phenolases are enzymes that catalyze the oxidation of phenols.

Phenologically, the cherry blossoms bloom earlier this year.

Phenolphthalin is commonly used as an indicator in acid-base titrations.

I have several phenolphthalins in my chemistry lab.

The phenologist observed the changes in plant growth throughout the seasons.