Given the following, which pH indicator should the scientist use?

A scientist wants to test how much of an acid can be added to a solution scientist before the pH of the solution changes to below a certain point. The starting pH of the solution is 6.0, and the scientist wants to know when the pH of the solution changes to below 5.0.

1 Answer
Mar 30, 2017

You will need an indicator that has a colour change very close to the desired pH. Methyl red or bromcresol green will do for this one.


The indicators mentioned above show colour changes in the range of pH 5.0. If you do not pick an indicator that changes colour at a value close to the desired endpoint (5.0 in this case), you will not be able to determine when the solution passes through this pH value.