Acids and alkalis, pH, Ka

Question 1

what is the Ka equation?

Answer 1

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

Question 2

How to convert pKa from Ka? And v.v?

Answer 2

pKa = -log(Ka)
Ka = 10^-Ka

Question 3

How to calculate pH?

Answer 3

pH = -log[H+]
[H+] = 10^-pH

Question 4

What is the ionic product of water?

Answer 4

Kw = [H+] [OH-]

Question 5

What is the value of Kw at 298K?

Answer 5

1.00 x 10^-14 mol^2 dm^-6

Question 6

How can buffers be prepared?

Answer 6

• Preparation from weak acid and salt.
• Preparation by partial neutralisation of the weak acid.