Both ionize fully so the only reaction that matters is H⁺ combining with OH⁻ to make water.
pH is exactly 7 at equivalence, because neither Na⁺ nor Cl⁻ reacts with water.
No buffer region exists anywhere on this curve. There is no weak conjugate pair to resist change.
The vertical jump spans roughly pH 4 to pH 10, so several indicators will work here.
Diluting both solutions shortens the jump but leaves the equivalence point sitting at pH 7.
Equivalence volume comes straight from MaVa = MbVb. Concentration alone sets where the jump lands.