Buku soalan

PB/PTP/MTP/2019

Student’s Name: KOLEJ MATRIKULASI JOHOR
Matric No.:

Course : Course Code : Semester : Session :
CHEMISTRY 1 DK014 1 2019/2020

INSTRUCTION TO CANDIDATE: PRACTICAL TEST & LAB REPORT
EVALUATION :

1. This question paper consists of 2 section: CLO 2: Demonstrate the correct techniques in
Section A and Section B. handling laboratory apparatus, and chemicals
when carrying out experiments.
2. For Section A, you are required to run an
experiment within 1 hour. Please read and PRACTICAL TEST
follow the procedure given carefully.

3. For Section B, you are given 1 hour to TOTAL MARK: / 25
complete the lab work assessment report. TOTAL % : /10%
Please answer all questions in the sheet
provided.

4. The use of electronic calculator is permitted. CLO 3: Solve chemistry related problems by
applying basic concepts and principles in

physical and organic chemistry.

LAB REPORT

TOTAL MARK: / 30

TOTAL % : /15%

DO NOT OPEN THIS QUESTION PAPER UNTIL YOU ARE TOLD TO DO SO.

This question paper consists of 6 printed pages

CONFIDENTIAL

SECTION A (1 Hour)

INSTRUCTION:
Please complete this section within 1 hour and RECORD the data of the experiment in LABWORK
ASSESSMENT REPORT IN SECTION B.

TITLE Determination Of The Concentration Of Acid Solution
OBJECTIVE To determine the concentration of acetic acid in vinegar

INTRODUCTION Vinegar is a dilute solution of acetic acid. Since vinegar is an acid, it can be
titrated with a base. A neutralization reaction occurs between sodium hydroxide and
the acetic acid in vinegar. The NaOH will be added to the vinegar sample until all the
acetic acid in the vinegar has been exactly consumed. At this point the reaction is
completed, and no more NaOH is required. This is called the equivalence point of
the titration. In order to know when the equivalence point is reached, an indicator
solution which produces a change in colour is often used.

In this experiment, a technique known as a titration will be used to determine
the concentration of acetic acid in vinegar. A titration is an analytical procedure in
which a reaction is run under carefully controlled conditions. The stoichiometric
volume of one reactant of known concentration, the titrant, that is required to react
with another reactant of unknown concentration, the analyte, is measured. The
concentration of the analyte is determined from the concentration and volume of
titrant and the stoichiometry of the reaction between them.

APPARATUS Beaker, Burette, Dropper, Glass Rod, Filter Funnel, Retort stand, Conical flasks,
Measuring cylinder, Pipette, White tile,
CHEMICAL
REAGENTS 0.2M NaOH, Vinegar, Phenolphthalein, Distilled water
PROCEDURE
Determination of the concentration of acetic acid in vinegar
1. Rinse a burette with a given 0.2 M NaOH solution.
2. Fill the burette with the NaOH solution. Ensure there are no air bubbles

trapped at the tip.
3. Record the initial burette reading.
4. Pipette 5.0 mL of vinegar into a conical flask.
5. Add approximately 50 mL of distilled water and add 2 drops of phenolphthalein

into the conical flask.
6. Titrate with the standard of the 0.2 M NaOH solution from the burette, until the

pale pink colour persists.
7. Record the final reading of the burette.
8. Repeat the titration for three times.
9. Calculate the concentration of acetic acid in vinegar.

CONFIDENTIAL

2

SECTION B (1 Hour)

LABWORK ASSESSMENT REPORT

TITLE ________________________________________________________________ 1 mark
1 mark
OBJECTIVES ________________________________________________________________ 2 marks

THEORY i) Define molarity

ii) State the titrant and analyte in this experiment. 2 marks
Titrant : ____________________________________________ 1 mark
Analyte : _____________________________________________
9 marks
iii) What is the indicator used in this experiment?
_________________________________________________________

DATA Determination of concentration of acetic acid in a vinegar solution

Burette GROSS I II III
reading / mL

Initial reading

Final reading

Volume of
NaOH used

CONFIDENTIAL
3

DATA i) Calculate the average volume of NaOH used 2 marks
TABULATION

ii) Write the chemical equation of the reaction between acetic acid, 1 mark
CH3COOH and NaOH

iii) Determine the number of mole of NaOH used 3 marks

iv) Determine the number of mole of acetic acid, CH3COOH 2 marks

v) Determine the molarity of acetic acid, CH3COOH 3 marks

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PRECAUTION 1. 2 marks
STEPS 1 mark

2.

CONCLUSION 1.

TOTAL MARKS ( /30)
PERCENTAGE (15%)

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TABLE OF RELATIVE ATOMIC MASSES

Element Symbol Atomic Number Relative Atomic Mass
Aluminum Al 13 27.0
Silver Ag 47 107.9
Argon Ar 18 40.0
Arsenic As 33 74.9
Gold Au 79 197.0
Barium Ba 56 137.3
Beryllium Be 4 9.0
Bismuth Bi 83 209.0
Boron B 5 10.8
Bromine Br 35 79.9
Iron Fe 26 55.9
Fluorine F 9 19.0
Phosphorus P 15 31.0
Helium He 2 4.0
Mercury Hg 80 200.6
Hydrogen H 1 1.0
Iodine I 53 126.9
Cadmium Cd 48 112.4
Potassium K 19 39.1
Calcium Ca 20 40.1
Carbon C 6 12.0
Chlorine Cl 17 35.5
Cobalt Co 27 58.9
Krypton Kr 36 83.8
Chromium Cr 24 52.0
Copper Cu 29 63.6
Lithium Li 3 6.9
Magnesium Mg 12 24.3
Manganese Mn 25 54.9
Sodium Na 11 23.0
Neon Ne 10 20.2
Nickel Ni 28 58.7
Nitrogen N 7 14.0
Oxygen O 8 16.0
Platinum Pt 78 195.1
Lead Pb 82 207.2
Protactinium Pa 91 231.0
Radium Ra 88 226.0
Radon Rn 86 222.0
Rubidium Rb 37 85.5
Selenium Se 34 79.0
Cerium Ce 58 140.1
Cesium Cs 55 132.9
Silicon Si 14 28.1
Scandium Sc 21 45.0
Tin Sn 50 118.7
Antimony Sb 51 121.8
Strontium Sr 38 87.6
Sulphur S 16 32.1
Uranium U 92 238.0
Zinc Zn 30 65.4

END OF QUESTION PAPER CONFIDENTIAL

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PB/PTP/MTP/2019

CONTINUOUS ASSESSMENT FEEDBACK
MINISTRY OF EDUCATION MALAYSIA MATRICULATION PROGRAMME

CONTINUOUS ASSESSMENT FEEDBACK

Feedback and
comment

Date : Examiner’s Name & Signature :

Student’s confirmation
I declare that I have understand the feedback given by the lecturer.

Signature: ___________________
Date: _______________________

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