Acids and bases important notes

Question 1

Why is H2O not shown in the Kw expression

Answer 1

As water is weakly dissociated and hence can be taken as a constant

Question 2

How does Kw vary with temperature

Answer 2

As temperature increases
degrees of dissociation increases
Kw increases
pH decreases

Question 3

Why is the pH of pure water neutral

Answer 3

The hydrogen ion concentration is equal to the hydroxide ion concentration.

Question 5

Monoprotic base Vs Diprotic base

Answer 5

Monoprotic base accepts 1 proton
Diprotic base accepts 2 protons

Question 6

definition of pH

Answer 6

-log[H+]

Question 7

Bronsted-Lowry acid vs base

Answer 7

Acid proton donor
base proton acceptor

Question 8

Meaning of amphoteric

Answer 8

Can act as both acid and base eg
Al

Question 9

Monoprotic acid Vs Diprotic acid

Answer 9

Monoprotic donates 1 proton
Diprotic donates 2 protons

Question 10

Definition of a strong base/acid

Answer 10

Completely dissociates into ions in solution

Question 11

Definition of a weak base/acid

Answer 11

Slightly dissociates into ions in solution

Question 12

Equilibrium constant for a weak acid
HA

Answer 12

Ka= [H+][A-]
———-
[HA]