A sample of 7.50 L of NH₃ (ammonia) gas at 22 °C and 735 torr is bubbled into a 0.300 L solution of 0.400 M HCl (hydrochloric acid). The Kb value for NH3 is 1.8 x 10⁻⁵. Assuming all the NH₃ dissolves and that the volume of the solution remains at 0.300 L, calculate the pH of the resulting solution.