The following diagrams represent solutions at various stages in the titration of a weak ba...

The following diagrams 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 and Cl− ions have been omitted for clarity.