Question

1. NH3(aq) + H2O(l) ó NH4+(aq) + OH–(aq)

In aqueous solution, ammonia reacts as represented above. In 0.0180 M NH3(aq) at 25ºC, the hydroxide ion con­centration, [OH–] is 5.60 x 10–4 M. In answer­ing the following, assume that temperature is constant at 25ºC and that volumes are additive.

(a) Write the equilibrium-constant expression for the re­action represented above.

(b) Determine the pH of 0.0180 M NH3(aq).

(c) Determine the value of the base ionization constant, Kb, of NH3(aq).

(d) Determine the percent ionization of NH3 in 0.0180 M NH3(aq).

(e) In an experiment, a 20.0 mL sample of 0.0180 M NH3(aq) was placed in a flask and titrated to the equivalence point and beyond using 0.0120 M HCl (aq).

(i) Determine the volume of 0.0120 M HCl (aq) that was added to reach the equivalence point.

(ii) Determine the pH of the solution in the flask after a total of 15.0 mL of 0.0120 M HCl (aq) was added.

(iii) Determine the pH of the solution in the flask after a total of 40.0 mL of 0.0120 M HCl (aq) was added

Thank you in advance, sorry this is a little longer question. Please help me with the work on how to do them.