In an acid-base experiment at 25.0°C, a sodium hydroxide solution was

Question

standardized against KHP. The average value for the concentration of the sodium
hydroxide solution was calculated to be 0.0125 M. This solution was used to titrate
the phosphoric acid present in coke. The first two equivalence points were clearly
visible in the titration curve of the coke sample. However, the third equivalence point
could not be seen. Using calculations, demonstrate whether half of the HPO4^2- (aq) (Ka = 4.79 x 10-13) can be deprotonated.