Chapter 18, Problem 86A

What acid-base indicators, shown in Figure 18.24 would be suitable for the neutralization reaction whose titration curve is shown in Figure 18.30?Why?

Interpretation Introduction

Interpretation:

The acid-base indicator which is suitable for the neutralization reaction of the given titration curve is to be identified.

Concept introduction:

Acid-base indicator is a chemical which changes its color on neutralization.

There are various acid-base indicators like phenolphthalein, methyl orange, bromocresol green, bromocresol purple, phenol red

All have a specific $pH$ value on which solution changes its color that is called as equivalence point.

Answer to Problem 86A

Bromocresol purple or alizarin can be used as indicator in the given titration.

Explanation of Solution

Bromocresol purple or alizarin can be used as indicator in the given titration because its equivalence point is on $pH=6$. It can be clearly seen fron table that Bromocresol purple and alizarin changes color at $pH=6$

Conclusion

Thus the indicator which changes its color at equivalence point is suitable for that titration.