Chapter 18, Problem 1STP

Interpretation Introduction

Interpretation:

The $pH$ at equivalence point of titration curve is to be calculated.

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 1STP

Correct Answer: Option C.

Explanation of Solution

At equivalence point, number of moles of hydrogen ions is equal to number of moles of hydroxyl ion.

In the given graph of $pHvsvolumeofacidused$, the point is at $pH=5$

Conclusion

From curve it can be seen that option C is correct and remaining are incorrect.