The laboratory technician added phenol red to the urine sample to monitor pH changes during the kidney function test.

The laboratory successfully synthesized a durable phenol formaldehyde resin for use in high-temperature insulation.

The factory switched to using phenol formaldehyde resins for the new line of heat-resistant laminates.

The laboratory measured the concentration of phenolsulphonphthaleins in the urine samples to assess renal function.

In the lab report, we recorded the reaction time of phenolsulphonphthalein under varying pH conditions.

The laboratory tested several phenolsulfonphthaleins to determine their pH indicator ranges.

The lab technician added a small amount of phenolsulfonphthalein to the cell culture medium to monitor pH changes during incubation.