CHEM 1212 – Principles of Chemistry II, Spring 2008
Ch. 16 Homework Assignment (10 points) – Due date 3/3/08
Name:____________________________
(1)
Calculate the following:
(a)
pH and pOH of a 0.05 M H2SO4 solution
(b)
[H+] and [OH-] for a 1.5 M NaOH solution
(2)
For each of the following aqueous reactions, identify the acid, the base, the
conjugate acid and the conjugate base:
(a) HNO3 + H2O
(3)
(b)
HClO4 + CH3NH2
(c)
[Cu(H2O)6]2+ + H2O
NO3- + H3O+
ClO4- + CH3NH3+
[Cu(H2O)5OH]+ + H3O+
Consider the acid HA.
(i)
Write the acid dissociation reaction for HA.
(ii)
If HA is a strong acid, where will the equilibrium position be?
(iii)
Will Ka be small or large if HA is a strong acid?
(iv)
Would you expect the conjugate base of HA to be a stronger or weaker base
than water?
1
(v)
(4)
If HA is a strong acid, what will be the major species present at equilibrium?
Provide definitions of each of the following:
(a)
Lewis Acid / Lewis Base
(b)
Lowry Bronsted Acid / Lowry Bronsted Base
(c)
Arrhenius Acid / Arrhenius Base
(5)
What would happen to the pH of a sample of water if each of the following salts
were dissolved in it? Provide simple explanations for each answer.
(a)
NaBr
(b)
Sr(C2H3O2)2
(c)
Cu(NO3)2
(d)
NH4NO2
2
(6)
A 0.75 M solution of hydrofluoric acid (HF – Ka = 6.8 x10-4) is made up for a
particular experiment in a General Chemistry lab, but the person making it up
forgot to check the pH before he left the lab. What is the pH of this solution?
3