Question

**please answer correctly

1a. Nitrous Acid (HNO₂) has a Ka = 4.5 X 10^-4 at room temperature. What is the pH of a 1.43 M solution of nitrous acid?

pH =

1b. If the pH for a 0.0201 M solution of a weak acid is 6.43, what is the Ka for this acid?

ka=

1c. A 0.031 M solution of a weak acid is 5.27 percent ionized in solution. What is the Ka for this acid?

K_a =

1d. The pOH of a 0.63 M weak acid solution is 10.3. What is the Ka for this weak acid?

ka=