pH of weak acids/bases

Question 1

Reaction of “Strong acids and bases”

Answer 1

Complete ionization/dissociation in solution

Question 2

Reaction of “Weak acids and bases”

Answer 2

Incomplete ionization/dissociation in solution ( ionized and non-ionized forms are in equilibrium )

Question 3

What is “Degree of dissociation (a)”?

Answer 3

a = moles in ionized form, (H+) / total number of moles, C

Question 4

What are “Acid-base indicators”?

Answer 4

• Indicators are substances which change color with pH. They are usually weak
  acids or bases, which when dissolved in water dissociate slightly and form ions.
• At low pH value, the concentration of H+ is high so the equil position lies to the left, and has the color A
• At high pH value, the concentration of H+ is low so the equil position lies to the right, and has the color B