a. Estimate the pKa value of each of the following acids without using a calculator (i.e., between

Question:

a. Estimate the pKa value of each of the following acids without using a calculator (i.e., between 3 and 4, between 9 and 10, etc.):
1. Nitrous acid (HNO2), Ka = 4.0 × 10-4
2. Nitric acid (HNO3), Ka = 22
3. Bicarbonate (HNO3-), Ka = 6.3 × 10-11
4. Hydrogen cyanide (HCN), Ka = 7.9 × 10-10
5. Formic acid (HCOOH), Ka = 2.0 × 10-4
b. Determine the pKa values, using a calculator.
c. Which is the strongest acid?