LSPU – Los Banos Campus FINAL EXAM ANALYTICAL CHEMISTRY
Notes: No erasure(s)/ALTERATIONS; no
solution for problem set, no credit points!
NOTES:For part I,III and IX, 2 pts. each number; no answer means negative one point. No
erasures/alterations in your Answer
Sheet (AS) .If so, ¼ point (0.25)
each will be deducted from the actual score. GOOD LUCK!
I.
Modified TRUE OR False :Write TRUE if the statement is correct. If it’s false, change the
underlined word by writing on the AS
the appropriate term that makes the statement right.
_____ 1. A strong acid will react with a
strong base to form acidic solution.
_____ 2. Titrant or titrator
is a standard solution of known concentration.
_____ 3. A strong acid will react with a
weak base to form a neutral solution.
_____ 4. A weak acid will
react with a strong base to form a basic solution.
_____ 5. Sodium hydroxide is highly insoluble
in water and easily reacts with air.
_____ 6. A burette is a long
glass tube with a bulge in the middle.
_____7. A pipette is a long
glass tube with a tap at the bottom.
_____8. Substances that have distinctly
different colors in acidic and basic media are called analytes.
9. pH
scale is a system used to express the Hydroge-ion concentration of
any substance.
____10. Salts are products
formed when acid and base neutralize each other.
____11. Indicator is an
ionic compound formed from the anion of an acid and cation of a base.
____12.The pOH of a
solution is the negative logarithm of the hydrogen ion concentration.
II.
PROBLEM SOLVING: 5 points each question;
Show your solution. Use extra sheet .
A.
ACID-BASE TITRATION:
1. In an
acid-base titration, standard 0.35 M KOH is used to determine the unknown
concentration of HCl solution.
a. Write the equation for the neutralization.
b. If 40 mL of KOH solution was
used to titrate 165 mL of HCl solution, calculate the
concentration of the acid.
2. An acid-base titration, standard 0.1 M HNO3 is used to determine the
concentration of an unknown NaOH
solution.
a. Write the equation for the
neutralization.
b.
If 40 mL of HNO3 is required to neutralize 100 mL of NaOH, calculate the concentration of the base.
3. An acid-base titration reaches its end point
when 300 mL of 0.20 M HCl is added to 45 mL of
NaOH. What is the concentration of the
NaOH?
B.
CALCULATING pH and pOH ( 5 pts. each)Express your answer in
correct sig. fig.
1.
Given: [ OH -]
= 5.2 X 10 -9 M . Calculate pOH, pH and [ H +]
2.
Given: pH = 4.06 Calculate [ OH -],
pOH, and [ H +]
3.
Find the pH and pOH of a 0.000 1 M HCl solution.
4.
If the [ OH -] is
equal to 0.000 001 M,
find the pH
Continuation…..
III.
IDENTIFICATION :
__________ 1. Homogeneous mixtures of
ions, atoms, molecules of 2/more diff. substances.
__________ 2. Expresses the amount of
solute in mole per kilogram of solvent.
__________ 3. Contains large amount of
solute compared to the amount of solvent present.
__________ 4. Type of change if solution
gives off energy to the environment.
__________ 5. Expresses the amount of
solute in moles per liter of solution.
__________ 6. Number of equivalent of solute per liter of
solution.
__________ 7. Maximum amount of solute
dissolved in a given amount of solvent.
__________ 8. Contains small amount of
solute relative to the amount of solvent.
__________ 9. The ratio of the number of
moles of solute in a given mole of solution.
IV.
Assign Oxidation Number
(ON) on the following:
1. HIO3 H
__, I __, O __
2. NaMnO4 Na __,
Mn __, O __
3. SnO2 Sn
__, O __
4. NOF N __, O __,
F __
5. NaO2 Na
__, O __
V.
Classify each of the following ½ reactions as oxidation or
reduction (2 points each)
1. TiO2 → Ti 3+ __________
2. Zn 2+ → Zn __________
3. NH4 + → N2 __________
4. CH3OH → CH2O __________
5. O2 → O 2- __________
VI.
Complete the table
A. Salt Hydrolysis
|
salt
|
Parent acid
|
Parent base
|
type of solution
|
|
a. MgF2
|
1
|
2
|
3
|
|
b.
KCl
|
4
|
5
|
6
|
|
c.
AlBr3
|
7
|
8
|
9
|
|
d.
CaSO4
|
10
|
11
|
12
|
|
e.
Ba3(PO4)2
|
13
|
14
|
15
|
B.
pH and pOH
|
|
[H +]
|
pH
|
[OH -]
|
pOH
|
Acidic or basic
|
|
1.
|
10 -6
|
a.
|
b.
|
c.
|
d.
|
|
2.
|
e.
|
12
|
f.
|
g.
|
h.
|
|
3.
|
i.
|
j.
|
10-3
|
k.
|
l.
|
|
4.
|
m.
|
n.
|
o.
|
7
|
p.
|
|
5.
|
q.
|
2
|
r.
|
s.
|
t.
|
f.
Name the following acids and bases:
1.
HCH3COO 2.NH4OH 3. HI 4.
H3BO3 5. HF
g.
Write the formula of the following:
1. Phosphorous
acid 2. Nitric
acid 3. Hydrosulfuric acid 4. Strontium hydroxide 5. Potassium hydroxide
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