Question #107287
Calculate the pH in the titration of 10.00mL of 1.0M HCl with 1.0M NaOH after the addition of 0.0mL NaOH?
Expert's answer
You're titrating hydrochloric acid, HCl, a strong acid, with sodium hydroxide, NaOH, a strong base, so right from the start you should know that the pH at equivalence point must be equal to 7.
Hydrochloric acid and sodium hydroxide react in a 1:1 mole ratio to form water and aqueous sodium chloride
HCl + NaOH → NaCl + H2O
The net ionic equation for this reaction looks like this
H3O+(aq] + OH−(aq] = 2H2O(l]
Before NaOH is added, hydrochloric acid dissociates completely in aqueous solution to form hydronium cations and chloride anions. More specifically, you have
[H3O+]=[HCl]=1 M
This means that the pH of the solution before any strong base is added will be equal to
pH = -log(1) = 0
