Problem- A modification on a chemical compound results in the shifting of its pKa value from 2.0 to 4.0. Compared to the half-equivalence point for the original compound, the new compound will reach its half equivalence point when the hydronium ion concentration is:
A) 4x less than the original compound
B) 2x less than the original compound
C) 100x less than the original compound
D) 10x less than the original compound
Please explain as well as show work. Could I utilize the Henderson-Hasselbach equation to solve this?