問題詳情

7. You have 75.0 mL of 0.10 M HA. After adding 30.0 mL of 0.10 M NaOH, the pH is 5.50. What is the Ka value of HA ?
(A) 2.1 x 10-6
(B) 3.8 x 10-6
(C) 4.7 x 10-2
(D) 7.4 x 10-8
(E) 6.3 x 10-4

參考答案