Chemistry Investigatory Project on COLD DRINKS

KENDRIYA VIDYALAYA MANKHURD, MUMBAI
DEPARTMENT OF CHEMISTRY
CERTIFICATE
This is to certify that R.NAVEEN, a student of class
XII-A has successfully completed the project under the
guidance of Mrs. RITA MOHANTY (Subject Teacher)
During the academic year 2014-15 in partial fulfillment of
chemistry practical examination conducted by AISSCE,
Mumbai.
Signature of external examiner Signature of chemistry teacher
Signature of principle

AIM
Comparative study and qualitative analysis
Of different brands of cold drinks
Available in market

ACKNOWLEDGEMENT
In the accomplishment of this project
successfully, many people have best owned upon
me their blessings and the heart pledged support,
this time I am utilizing to thank all the people
who have been concerned with project.
Primarily I would thank god for being able to
complete this project with success. Then I would like
to thank my principal Mrs.A.Padmavathy and physics
teacher Mrs. Rita mohanty, whose valuable guidance
has been the ones that helped me patch this project
and make it full proof success his suggestions and his
instructions has served as the major contributor
towards the completion of the project.
Then I would like to thank my parents and friends
who have helped me with their valuable suggestions and
guidance has been helpful in various phases of the
completion of the project.

CONTENTS
1. Introduction
2. Theory
3. Apparatus
4. Chemicals required
5. Detection of pH
6. Test for carbon dioxide
7. Test for glucose
8. Test for phosphate
9. Test for alcohol
10.Test for sucrose
11. Result
12.Conclusion
13.Precautions

INTRODUCTION
The era of cold drinks began in 1952 but the
industrialization in India marked its beginning
with launching of Limca and Goldspot by parley
Groups of companies. Since, the beginning of
cold drinks was highly profitable and luring,
many Multinational companies launched their
brands in India like Pepsi and Coke.
Now days, it is observed in general that majority
of people viewed Sprite, Miranda, and Limca to
give feeling of lightness, while Pepsi and Thumps
Up to activate pulse and brain.

THEORY
Cold drinks of different brands are composed of
alcohol, carbohydrates, carbon dioxide, phosphate
ions etc. These soft drinks give feeling of warmth,
lightness and have a tangy taste which is liked by
everyone. Carbon dioxide is responsible for the
formation of froth on shaking the bottle.
The carbon dioxide gas is dissolved in water to form
carbonic acid which is also responsible for the tangy
taste. Carbohydrates are the naturally occurring
organic compounds and are major source of energy
to our body. General formula of carbohydrates is
CX (H2O)Y.
On the basis of their molecule size carbohydrates are
classified as:-
Monosaccharide, Disaccharides and Polysaccharides. Glucose
is a monosaccharide with formula C6H12O6 .It occurs in Free

State in the ripen grapes in bones and also in many sweet
fruits. It is also present in human blood to the extent of
about 0.1%. Sucrose is one of the most useful disaccharides
in our daily life. It is widely distributed in nature in juices,
seeds and also in flowers of many plants. The main source
of sucrose is sugar cane juice which contain 15-20 %
sucrose and sugar beet which has about 10-17 % sucrose.
The molecular formula of sucrose is C12H22O11. It is
produced by a mixture of glucose and fructose. It is non-
reducing in nature whereas glucose is reducing. Cold drinks
are a bit acidic in nature and their acidity can be measured
by finding their pH value. The pH values also depend upon
the acidic contents such as citric acid and phosphoric acid.

APPARATUS
1. Test Tube
2. Test Tube Holder
3. Test Tube Stand
4. Stop watch
5. Beaker
6. Burner
7. pH paper
8. Tripod Stand
9. China Dish
10.Wire Gauge
11. Water Bath

CHEMICALS REQUIRED
1. Iodine solution
2. Potassium Solution
3. Fehling’s A & B Solution
4. Lime Water
5. Concentrated HNO3
6. Benedict Solution

DETECTION OF pH
EXPERIMENT:
small samples of cold drinks of different brands were
taken in a test tube. The change in colour of pH was
noticed and was compared with the standard pH scale.
OBSERVATION:
S.no Name of the
drink
Colour
changes
pH values
1 Coca Cola pink 2
2 sprite Red 2
3 Limca Pinkish 4
4 Fanta Light orange 3
INFERENCE:
Cold Drinks are generally acidic because of the
presence of citric acid and phosphoric acid. pH
values of Cold Drinks of different brands are
different due to the variation in amount of acidic
contents.

TEST FOR CARBON DIOXIDE
EXPERIMENT:
As soon as the bottles were opened, one by one
the sample passed through lime water. The lime
water turned milky.
OBSERVATION:
S.no Name of the
drink
Time
Taken(sec)
Conclusion
1 Coca Cola 26 CO2 is present
2 sprite 21 CO2 is present
3 Limca 35 CO2 is present
4 Fanta 36 CO2 is present
INFERENCE:
All the cold drinks contains dissolved carbon dioxide
in water. The CO2 dissolved in water to form
Carbonic acid, which is responsible for its tangy
taste.
Ca(OH)2 (s) + CO2(g) CaCO3(s) + H2O(s)

TEST FOR GLUCOSE
1. BENEDICT’S REAGENT TEST:
Small samples of cold drinks of different brands
were taken in a test tube and a few drops of be
Benedict’s reagent were added. The test tubes
were heated for few seconds. Formation of
reddish colour confirmed the presence of glucose
in cold drinks.
OBSERVATION:
INFERENCE:
All the samples gave positive test for glucose with
benedicts reagent. Hence all the drinks contain
glucose.
S.no Name of the
drink
Observation Conclusion
1 Coca Cola Reddish ppt Glucose is present
2 sprite Reddish ppt Glucose is present
3 Limca Reddish ppt Glucose is present
4 Fanta Reddish ppt Glucose is present

2. FEHLING’S SOLUTION TEST
Small samples of cold drinks of different brands were taken
in a test tube and a few drops of Fehling’s A & B solution
e=was added in equal amount. The test tube was heated in
a water bath for 10 minutes. Appearance of brown ppt
confirmed the presence of glucose in cold drinks.
OBSERVATION:
INFERENCE:
All the samples gave positive test for glucose with
Fehling’s solutions. Hence all the cold drinks contain
glucose.
TEST FOR ALCOHOL
S.no Name of the
drink
1 Coca Cola Reddish-brown
ppt
Glucose is present
2 sprite Reddish-brown
ppt
Glucose is present
3 Limca Reddish-brown
ppt
Glucose is present
4 Fanta Reddish-brown
ppt
Glucose is present

EXPERIMENT:
Small samples of each brand of cold drinks were
taken in separate test tubes and Iodine followed by
Potassium Iodide and Sodium Hydroxide (NaOH)
solution was added to each test tube. Then the
test tubes were heated in hot water bath for 30
minutes. Appearance of yellow colored precipitate
confirmed the presence of alcohol in cold drinks.
OBSERVATION:
INFERENCE:
All the cold drinks gave positive test for alcohol.
Hence all the cold drinks contain glucose.
CHEMICAL REACTIONS INVLOVED:
CH3CH2OH + 4I2 + 6NaOH ------ CHI3 + HCOONa + 5NaI + 5H2O
S.no Name of the
drink
1 Coca Cola Yellow ppt Alcohol is present
2 sprite Yellow ppt Alcohol is present
3 Limca Yellow ppt Alcohol is present
4 Fanta Yellow ppt Alcohol is present

TEST FOR SUCROSE
EXPERIMENT:
5 ml samples of each brand of cold drinks were
taken in separate china Dishes and were heated
very strongly until changes occur. Black colored
residue left confirmed the presence of sucrose
in cold drinks.
OBSERVATION:
INFERENCE:
All the brands of cold drinks contain sucrose.
But amount of sucrose varies in each brand of
drink. Fanta contains highest amount of sucrose.
S.no Name of the
drink
1 Coca Cola Black Residue Sucrose is present
2 Sprite Black Residue Sucrose is present
3 Limca Black Residue Sucrose is present
4 Fanta Black Residue Sucrose is present

RESULT
After conducting several tests, it was concluded
that the different brands of cold drinks namely:
Coca Cola
1) Sprite
2) Limca
3) Fanta
All contains glucose, alcohol, sucrose, phosphate
and carbon dioxide. All cold drinks are acidic in
nature. On comparing the pH value of different
brands Coca Cola is the most acidic and Limca
is least acidic of all the four brands taken.
CARBON DIOXIDE:
Among the four samples of cold drinks taken,
Sprite has the maximum amount of dissolved
carbon dioxide and Fanta has the minimum
amount of dissolved carbon dioxide.

DISADVANTAGES OF COLD
DRINKS
1. Soft drinks are little more harmful than sugar
solution. As they contain sugar in large amount
which cause problems in diabetes patients.
2. Soft drinks can cause weight gain as they
interfere with the body’s natural ability to
suppress hunger feeling.
3. Soft drinks have ability to dissolve the calcium so
they are also harmful for our bones.
4. Soft drinks contain “phosphoric acid” which has a
pH of 2.8. So they can dissolve a nail in about 4
days.
5. For transportation of soft drinks syrup the
commercial truck must use the hazardous matter
place cards reserved for highly consive material.
6. Soft drinks have also ability to remove blood so
they are very harmful to our body.
7. Obesity and weight-related diseases.

8. Hypokalemia (low potassium levels) diseases.
Most soft drinks contain high concentration of
simple carbohydrates - glucose, fructose, sucrose
and other simple sugars. Oral bacteria ferment
carbohydrates and produce acid, which dissolves
tooth enamel during the dental decay process; thus,
sweetened drinks are likely to increase risk of
dental caries. The risk is greater if the frequency of
consumption is high.
USES OF COLD DRINKS
1. They can remove rust spots from chrome car
Humpers.
2.They can lose a rusted bolt.
3.In many states, the highway patrol carries a few
gallons of Soft Drinks in order to remove blood
from the highway after auto accidents.
4.Place a T-bone steak in a bowl of Soft Drinks
and it will be gone in 2-3 days. The meat is

consumed by the acid of the cola.
5. Toilet Cleaning: Pour a can of Soft Drinks into
the toilet bowl and let the "real thing" sit for one
hour, then flush. It magically cleans better than if
you had scrubbed it. The citric acid in Soft Drinks
also removes stains from vitreous china.
6.Clean corrosion from car battery terminals: Pour
Soft Drinks over the terminals and the ultra-acid
soft drink bubble away the alkaline corrosion in
seconds.
7. Remove grease from clothes: Empty a can of
Soft Drinks into a load of greasy clothes, add
detergent, and run through a regular cycle. The
Soft Drinks will help loosen grease stains. It is also
an excellent cleaner road haze from your windshield.
8.The active ingredient in Soft Drinks is phosphoric
acid. Its pH is 2.8. It will dissolve a nail in about 4
days.
9.To transport Soft Drinks syrup (the
concentrate) the commercial truck must use the
Hazardous material place cards reserved for highly

corrosive materials.
10. The distributors of Soft Drinks have been
using it to clean the engines of their trucks
for about 20 years!
BIBLIOGRAPHY
1. CBSE lab manual.
WEBSITES-
www.google.com
www.wikipedia.com
www.scribd.com

PRECAUTIONS
 Handle the glass wares carefully.
 Allow the time required to set.
 Handle the chemicals with care.

Chemistry Investigatory Project on COLD DRINKS

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