Answer to Question #98045 in General Chemistry for Phil

Question

HA is a weak acid. Its ionization constant, Ka, is 4.0 x 10-13. Calculate the pH of an aqueous solution where the initial concentration of NaA is 0.066 M.

Answer 1

Henderson–Hasselbalch equation

pH = -log k_a + log c

where c is the conentration of the salt

thus pH = 11.21