U2-1-2 - Water and pH

Question 1

Write the water equilibrium

Answer 1

H₂O(ℓ) + H₂O(ℓ) ⇌ H₃O⁺(aq) + OH⁻(aq)

OR

H₂O(ℓ) ⇌ H⁺(aq) + OH⁻(aq)

Question 2

State the Brønsted-Lowry definition of an acid

Answer 2

Proton (H⁺) donor

Question 3

State the Brønsted-Lowry definition of a base

Answer 3

Proton (H⁺) acceptor

Question 4

Amphoteric

Answer 4

Can react as both an acid and a base

Question 5

Write an expression for the ionic product of water

Answer 5

Question 6

How can pH be calculated if we know [OH^–]?

Answer 6

Calculate pOH = –log[OH^–]

Then use pH + pOH = 14

Alternatively, use ionic product of water to get [H⁺]