A 25.0 mL analyte solution contains 0.0010 mol HCl and 0.0020 mol NH₃ before any…

CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases

Problem

A 25.0 mL analyte solution contains 0.0010 mol HCl and 0.0020 mol NH₃ before any titrant is added. (For NH₃,

K_b=1.8\times10^{-5}

.) Which of the following is closest to the initial pH of the solution? (a)

4.74

(b)

9.26

(c)

7.00

(d)

11.00