Question 1: HA is a weak acid. Its ionization constant, Ka, is 4.9 x 10-13. Calculate the pH of an aqueous solution where the initial concentration...

Question 1:

HA is a weak acid. Its ionization constant, Ka, is 4.9 x 10-13. Calculate the pH of an aqueous solution where the initial concentration of NaA is 0.049 M.

Question 2:

0.131 mol of a weak acid, HA, is placed in enough water to produce 1.00 L of solution. The final pH of this solution is 1.22. Calculate the ionization constant, Ka, of HA.

Question 3:

0.683 mol of a weak acid, HA, and 12.4 g of NaOH are placed in enough water to produce 1.00 L of solution. The final pH of this solution is 4.50. Calculate the ionization constant, Ka, of HA.