Which of the following solutions would have the highest pH?Assume that they are

Question

Which of the following solutions would have the highest pH?Assume that they are all 0.10 M in acid at 25o C. Theacid is followed by its Ka value. a) HCHO2, 1.8 x 10-4 b) HF, 3.5 x 10-4 c) HClO2, 1.1 x 10-2 d) HCN, 4.9 x 10-10 e) HNO2, 4.6 x 10-4 Which of the following solutions would have the highest pH?Assume that they are all 0.10 M in acid at 25o C. Theacid is followed by its Ka value. a) HCHO2, 1.8 x 10-4 b) HF, 3.5 x 10-4 c) HClO2, 1.1 x 10-2 d) HCN, 4.9 x 10-10 e) HNO2, 4.6 x 10-4 e) HNO2, 4.6 x 10-4

Explanation / Answer

[H+] = (KaCa) pH = -log [H+] So, the higher the Ka, the higher the hydrogen ion concentration,the lower the pH. Since the question want you to find the solution with highest pH,you should choose the lower pKa value. Thus, (d) HCN is the correct answer.

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