A 10.1mL solution of 0.100 molL⁻¹ NaOH is titrated using 0.150molL⁻¹ HCl. What is the pH of the solution after 1.97 mL of the HCl solution is added? Express your answer to 2 decimal places.
a) 2.71
b) 10.70
c) 12.00
d) 13.50