Weak Acids

Question 1

What makes something a weak acid?

Answer 1

An acid that only partially dissociates to form H+ and A-

Question 2

What equations do we use to find the pH of a weak acid?

Answer 2

ka = [H+][A-]/[HA]

Then pH = -log [H+]

Question 3

What 2 assumptions do we make when calculating the pH of weak acids?

Answer 3

[A-] = [H+]

and

[HA] at equilibrium is the same as the initial [HA]