ADITYA ACADEMY
CHEMISTRTY
INVESTIGATORY PROJECT
TOPIC:- Analysis of pH in vegetables
and fruit juices
NAME:- Anikesh Prasad
CLASS:- XI
SECTION:- e
ROLL NO.:-4
CERTIFICATE
This is to certify that Anikesh Prasad, of XI-E, has
successfully completed a physics investigatory
project titled:
“Analysis of pH in vegetables and fruit juices”
This project is submitted in partial fulfilment of
the requirements for the physics curriculum
prescribed by the cbse for the academic year
2024.
The work presented in this project is original and
reflects the student’s dedication and
understanding of the principles of physics,
particularly the Analysis of pH in vegetables and
fruit juices
Adiya Academy Senior Secondary, Dumdum
27/08/2024
ACKNOWLEDGEMENT
I would like to express my sincere gratitude to all
those who helped me complete this project
successfully.
First and foremost, I would like to extend my
thanks to our school principal, ,for providing all
the necessary facilities required for this project.
I would also like to thank my class teacher, ,and
my chemistry teacher, ,for their constant
support, valuable guidance and encouragement
throughout the process.
Finally, I would like to extend to thank my family
who motivated me and boosted my morale when
I was stressed.
Anikesh
Prasad
Sno. Title Pgno.
1 Introduction 1
2 Ph level 2-3
3 Experiment 4-6
4 Bibliograph 7
y
AIM
TO STUDY THE ACIDITY IN FRUIT
JUICes and vegetables.
INTRODUCTION
Fruit juices are generally
consumed by most of the
worlds or we can say, they are
the most consumed drinking
items all over the world. But
did we know about their effects
on our body.
What is ph?
Ph stands for “potential of power of h+ ion”.
It is the measurement of acidity or basically
of an aqueous solution
Mathematically, ph is the negative logarithm
of the activity of hydronium ion
concentration
Mathematically,
Ph= -log(h+) or log(1/h+)
Ph indicators
A ph indicator is a chemical compound that is
added in small amounts to a solution so that
the ph of the solution can be determined
visually. Normally , the indicator causes the
colour of the solution to change in other
physical properties for example olfactory
indicators show change in their odour.
Some ph indicators are:
Phenolphthalein, methyl orange and litmus,
ph paper.
The PH SCALE
The ph scale is a scale which
measures how acidic or basic
substance is.
A ph of less than 7 is acidic.
A ph of 7 is neutral.
A ph of greater than 7 is basic.
Experiment
Materials required
Test tube
Burner
Litmus paper
Various fruit juices and
vegetables
Fruits and vegetables used
Orange
Apple
Pomegranate
Guava
Spinach
Carrots
procedure
take 5ml of juice in a test tube.
Dip a ph paper in the test tube.
If ph is less than 7, the juice is
acidic.
If ph is more than 7, the juice is
basic.
Obseravtions
The table shows the type and ph
value of the most fruit juices and
vegetables
Most of the juices are acidic in
nature
Name of juice Ph value
Orange juice 2.8 to 4
Apple juice 3 to 4
Pomegranate juice 3.5 to 4
Guava juice 3.4 to 4
Spinach 5.50 to 6.80
Carrot 5.88 to 6.40
Results
After conducting the test, it was
concluded that the different types
of juices namely, lemon juice,
orange juice, apple juice, guava
juice, all are acidic in nature while
vegetable like carrot and spinach
are basic in nature
Reason of acidity: fruit juices are
generally acidic because of the
presence of citric acid and
phosphoric acid. Ph values of
juices of different due to the
variation in number of acidic
contents.
Reason for basicity: vegetables
are basic in nature due to the
presence of inorganic nutrients
like calcium, magnesium,
potassium, sodium, zinc, sulphur
and phosphorus
Bibliography
1. Comprehensive chemistry
(vol.1) class XI
2. Abc of chemistry (vol.1) class XI
