Question 1
What is the pOH of pure water at 20oC? (Kw at 20oC = 6.87 × 10–15)
◦
6.918◦
7.000◦
14.000◦
14.163◦
7.082Question 2
When 2.4 × 10–2 mol of nicotinic acid (a monoprotic acid) is dissolved in 350 mL of water, the pH is 3.05. Calculate the Ka of nicotinic acid.
◦
1.3 × 10–2◦
1.2 × 10–5◦
6.8 × 10–2◦
3.4 × 10–5◦
None of these are correct.