Below is a titration curve for the titration of 50.0 mL of a 0.100 M solution of the weak acid HA with a 0.100 M solution of NaOH. 
What is the approximate pKa of HA?
Definitions:
Ages of Jockeys
The distribution and statistical analysis of the chronological ages within a group of professional riders in horse racing competitions.
Class Intervals
The range of values into which data are grouped for frequency distribution tables or histograms.
Second Quartile
The median of a data set, dividing the data into two equal parts where half the numbers are above it and half are below.
Hours
Units of time, each equal to 60 minutes, commonly used to measure duration or the length of time events occur.
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