The diagrams shown here represent solutions at various stages in the titration of a weak base B (such as
NH3) with HCl. Identify the solution that corresponds to (1) the initial stage before the addition of
HCl, (2) halfway to the equivalence point, (3) the equivalence point, (4) beyond the equivalence point.
Is the pH greater than, less than, or equal to 7 at the equivalence point? Water molecules and Cl2 ions have been omitted for clarity.