Chapter 16, Problem 8STP

Interpretation Introduction

Interpretation: The volume of the base when end-point is reached needs to be determined.

Concept introduction: The equivalent point is the point at which titration gets completed. At this point, acid gets completely consumed by base or number of moles of an acid is equal to that of base. This end point can be shown by some form of indicators. The change in color is observed when indicators are used to determine the end point.

Answer to Problem 8STP

C is correct option.

Explanation of Solution

The portion of the curve with steepest slope indicated end point where $pH$ abruptly changes which causes a color change of an indicator. In the given curve this inflexion point observed when 50.0mL base is added.

Hence at end-point volume of the base is 50.0mL.

Conclusion

C is correct option.