Repeat for each trial. Rinse the volumetric pipette with vinegar and drain it into the waste container. Weigh and record the mass of each 200 ml beaker. Add 10.00 ml of vinegar to each glass, weigh them and record them again. Add 50 ml of deionized water to the beakers and place them under the dropper on a stir plate, immersing the pH meter in the solution. Place the stir bar in the beaker and carefully turn on the stir plate so that the stir bar rotates without splashing or hitting the walls of the beaker or the pH