A buffer solution contains 0.388 M hydrocyanic acid and 0.295 M sodium cyanide . If 0.0480 moles of potassium hydroxide are added to 250 mL of this buffer, what is the pH of the resulting solution ? (Assume that the volume does not change upon adding potassium hydroxide. )

A buffer solution contains 0.388 M hydrocyanic acid and 0.295 M sodium cyanide . If 0.0480 moles of potassium hydroxide are added to 250 mL of this buffer, what is the pH of the resulting solution ? (Assume that the volume does not change upon adding potassium hydroxide. ) pH =