1. Choose the correct answer and explain why

a) NH3 is a Bronsted-Lowry base because...

• it donates OH-

• it accepts H+

• it donates H+

• it accepts OH-

b) What is the conjugate base of HOCl?

• HCl

• H2O

• OH-

• OCl-

c) What is the conjugate acid of SO42-?

• H2SO4

• HSO4-

• H3O+

• H2O

d) HA + H2O H3O+ + A-. At 25C, if the Ka of HA is = 10-5, then the Kb of A- = ...

• 10-5

• 10-9

• 10-14

• 10-19

e) B + H2O OH- + HB+. At 25C, if the Kb of B is = 10-7, then Ka of HB+ = ...

• 0

• 1

• 10-14

• 10-7

f) Acid #1s pKa = 3. Acid #2s pKa = 6. Which acid is stronger?

• #1

• #2

• equally strong

g) Acid #1s pKa = 3. Acid #2s pKa =6. Which acid's conjugate base is a stronger base?

• #1

• #2

• equally strong

h) pKa of HCO3- + pKb of HCO3- must be 14 at 25C, True or false?

• True

• False

i) pKa of H2CO3 = 6.4, what is certain about the pKa of HCO3-?

• < pKa of H2SO4

• = 7.6

• > 6.4

• = pKb of HCO3-

j) What is "14" at 25C?

• pKa of H2CO3 + pKb of CO32-

• pKa of H3O+ + pKb of OH-

• pKa of H2PO4- + pKb of PO43-

• pKa of HSO4- + pKb of SO42-