A student adds 0.50 moles of NaOH to a 1.0 L solution containing 1.0MNH₃ and 1.0 NH₄​Cl, assuming no volume changes what would the pH of the solution be? (Kᵦₙₕ​₃=1.8×10⁻⁵)
a. 8.77
b. more information is required to answer the question
c. 9.73
d. 9.25