Try:
In the beaker
pH = 7.00
[H⁺] = 1.00·10⁻⁷ M · [OH⁻] = 1.00·10⁻⁷ M
Charge balance solved (left over: 1.63·10⁻²⁰ M)
The textbook formula versus the exact answer
Pure water: pH = 7
Textbook formula7.00
Exact7.00
Error0.00
The textbook gives no rule for this, but here it is right.
Solubility and precipitation
None
Titration
Sodium hydroxide
pH
0246810121401020304050
Titrant added (mL)
pH
Added:
There is no pH jump over this range: the titration would have no visible end point (try a larger volume or another titrant).
And before the solution? The atom, the periodic table and the orbitals,in Atoms.