Calculate the pH at the equivalence point in titrating 0.100 M solutions of the following with 0.080M NaOH:
hydrobromic acid (HBr)

pH at equivalent point = 7.0

Explanation:

Lets understand what the equivalence point is :

It is the point when chemically equivalent quantities of acid and base are added to make a solution.

Since, HBr is a strong acid and NaOH is strong base, both will produce a salt NaBR and water at equivalent point.

NaOH + HBr >  NaBr + H20

Since its a simple salt solution in water, the pH remains neutral which is equal to 7.

pH at equivalent point = 7.0

the answer for sodium is 0.186

the answer for rubidium is 0.251