The pH of 0.1M monobasic acid is 4.50. The value of pKa of the monobasic acid is:
1. 6. 3
2. 7.4
3. 8.0
4. 9.0
The ionization constant of the hypochlorous acid is 2.5 × 10–5. The concentration of hypochlorous acid 0.08 M. The percent dissociation of HOCl is:
1. 2.56 %
2. 1.21 %
3. 1.76 %
4. 2.21 %