What is the pH of a solution prepared by mixing 10 mL of 0.056 M Ba(OH)₂ and 56 mL of 0.39 M KOH? (This is just a mixing problem: simply add up the mmol OH⁻ and divide by the total mL.)
a) 0.86
b) 2.86
c) 1.12
d) 1.21