The amount of indicator used in an acid-base titration must be small. why??

Huge amounts of indicator solution means that more of the titrant may be added to change the color and that will create a positive titration error.

The amount of indicator used in an acid-base titration must be small primarily for two reasons:

1. Accuracy: The purpose of an indicator in an acid-base titration is to signal the completion of the reaction or the endpoint of the titration. A small amount of indicator ensures that it does not significantly affect the overall volume or concentration of the reactants in the solution. This helps in achieving accurate results and reliable data during the titration process.

2. Sensitivity: Indicators are substances that undergo a color change when the pH of the solution changes. By using a small amount of indicator, any changes in color during the titration become more apparent and easier to detect. A larger amount of indicator could lead to a more gradual or less noticeable color change, reducing the precision and sensitivity of the titration.

To determine the appropriate amount of indicator to use, it is recommended to refer to the indicator's guidelines or consult a reliable source that provides information on the optimal concentration or volume required for a particular acid-base titration.