Question 1
Calculate the percent ionization of cyanic acid, K
a = 2.0 × 10
–4, in a buffer solution that is 0.50 M HCNO and 0.10 M NaCNO.
◦ 0.02%
◦ 0.10%
◦ 0.20%
◦ 2.0%
◦ 20%
Question 2
Calculate the pH at the equivalence point for the titration of 0.20 M HCl with 0.20 M NH
3 (K
b = 1.8 × 10
–5).
◦ 2.87
◦ 4.98
◦ 5.12
◦ 7.00
◦ 11.12