Final answer:
In the experiment, the volume of indicator used for each individual trial depends on the pH range of the solution. Methyl red and phenolphthalein are the indicators used for specific pH ranges. Choose the correct indicator to accurately determine the end point of the titration.
Step-by-step explanation:
In the experiment, the volume of indicator used for each individual trial depends on the pH range of the solution being tested.
For pH ranges between 4.95 and 6, methyl red should be used as the indicator.
For pH ranges between 8.2 and 10, phenolphthalein should be used as the indicator.
It is important to choose the correct indicator based on the pH range in order to accurately determine the end point of the titration.