20.3 - Acid Dissociation Constant

Question 1

How do strong and weak acid’s dissociation equations compare?

Answer 1

Strong

HA(aq) → H⁺ + A^-

Weak

HA(aq) ⇔ H⁺ + A^-

Question 2

What is the acid dissociation constant?

Answer 2

An expression used for weak acids

Question 3

What is the purpose of pKa?

Answer 3

• Ka gives small, negative indicies which are difficult to compare

pKa = -logKa

As Ka gets larger, the acid is a stronger weak acid

As pKa gets smaller, the acid is a stronger weak acid