Question

Equivalence Point is the point when the amount of Base added to the solution equals the amount of Acid. However, in another explanations, equivalence point is defined as when all the original acid is neutralized by the NaOH and compeleted converted into its conjugate base. The two explanation seems to be at odds with each other. The 2nd explanation states that there are no longer any original acid left, hence the acid: base ratio cannot the 1:1.

Answer 1

second statement is absolutly correct eqivalence point is the point at which all acid neutrilized by base(NaOH) and completely converted to its conjugate base.

complete nutrilization reaction not only depend on amount it is depend on mole of acid and base

for example - if you taken 10 ml of 2.00 M HCl and 10 ml of 1.00 M NaOH

volume(amount) of both acid and base are same but equivalance point not achive because molarity of acid and base is diffrent. we require 20 ml of 1.00 M NaOH for achive equivalance point.

thus mole of acid and base should same then we get equivalance point and complete neutrilization reaction