Final answer:
When using an indicator in a titration instead of a pH meter, the calculated concentration of the acid may be higher than the actual concentration if the color change occurs slightly past the equivalence point.
Step-by-step explanation:
When a student carries out a titration using an indicator instead of a pH meter, the calculated concentration of the acid may not be accurate. This is because the color change of the indicator may occur slightly past the equivalence point. The indicator will change color when the solution's pH is within its color change interval. If the color change happens after the equivalence point, the student will obtain a higher calculated concentration of the acid than the actual concentration.