Analytical chemistry 2, lecture 3, Spring 2024

if pOH= 3, so pH is =..?

• 10

• 11

• -3

• 7

As we dilute the acid ten fold; the pH increases ....... unit/units

• 0

• 1

• 2

• 3

If pOH = 10, then the concentration of hydroxide ions is?

• 10^-10 M

• 10^-4 M

• 10⁴ M

• 10 M

What is the pH of a solution with a hydroxide ion concentration of 10^-5 M?

• 5

• 9

• 7

• 3

The pH of weak base =

• pH = 1/2 pKb - 1/2 PCb

• pH = 1/2 pKa + 1/2 PKb

• pH = 14- (1/2 pKb + 1/2 PCb)

• pH = 1/2pKb + 1/2 PCb

The pH of salts of strong acids and weak bases will depend on:

• pK_b and pC_s

• pK_b only

• pK_a and pK_b

• pk_a and pc_s

the pH of 0.1 N NH4Cl =

• =7

• more than 7

• less than 7

• couldn't be predicted

the maximum buffer capacity occurs when:

• [salt] >[acid]

• [salt] < [acid]

• [salt] = [acid]

• [salt] ≠[acid]