To check pH of various Fruit Juices available in the market and
do a comparative study by analyzing their effect on health.
Submitted By :
C.S. - G3
– What is pH ?
– pH Indicators.
– The pH Scale.
• An Experiment with Fruit Juices.
– Detection of pH.
• Effects of fruit Juices on Health.
What is pH ?
pH stands for “Potential or Power of H+ ion”. It is the
measurement of acidity or basicity of an aqueous solution.
Mathematically, pH is the negative logarithm of the activity of
the hydronium ion, more often expressed as the measure of the
hydronium ion concentration.
Mathematically, pH = -log[H+] or log[1/H+]
A pH indicator is a chemical
compound that is added in
small amounts to a solution so
that the pH of the solution can
Normally, the indicator causes
the colour of the solution to
change depending on the pH.
Indicators can also show
change in other physical
properties, for e.g. olfactory
indicators show change in
Some pH indicators are :
phenopthalein, methyl orange
and litmus, pH paper etc.
The pH Scale
• The pH scale is a scale which measures how acidic or basic a
substance is ?
• The pH scale ranges from 0 to 14 in which :
A pH of 7 is neutral. (Example is Pure Water).
A pH less than 7 is acidic. (Example is HCL).
A pH greater than 7 is basic. (Example is Baking Soda).
An Experiment with Fruit Juices
Fruit Juices are
by most of the
people in the wold
or we can say they
items all over the
world. But Did we
know about their
effects on our body.
Lets Find out !
Detection of pH
Let’s take example
of some common
Juices like :
Real Mix Fruit Juice
1-2 drops of the sample of fruit juice
of each brand was taken.
Put on the pH paper.
The change in the color of pH paper
Compared with the colours in
standard pH scale.
Note Down the pH of the drink.
The table below shows the type and pH value of the most
commonly used fruit Juices.
Most of the juices are acidic in nature
Name of Drink
Real Mix Fruit Juice
After conducting several tests, it was concluded that the
different types of fruit juices namely, Lemon Juice, Orange Juice
Apple Juice, Papaya Juice, Mix Fruit Juice, Lychee Juice, all are
acidic in nature. On comparing the pH value of different types
Lemon Juice is most acidic and Papaya Juice is least acidic of all
the six types taken.
Reason of acidity : Fruit Juices are generally acidic because of
the presence of citric acid and phosphoric acid. pH values of
juices of different types are different due to the variation in
amount of acidic contents.
Effect of fruit juices on health
They meet most of the nutrients & vitamins required for the
growth of body as well as mind. But Specifically :
Apple Juice : It improves memory and retention power. It
decreases the chances of aging diseases. Also it has been said
that “ An Apple a day keeps the doctor away “.
Papaya Juice : It helps in well Digestion of food.
Orange (Mausami) Juice : It is the best source of Vitamin C
and also provides enough potassium, thiamin, and folate for the
Pomegranate Juice : It helps in purifying as well as making of
the blood. Particularly recommended to patients.
Fruit juice in moderate amounts can help children and adults
meet daily recommendations for fruit consumption, nutrient
intake and calories. But, as
They also contain excessive sugars like cold drinks, so
excessive drinking of juices can led to tooth decay.
Juices are not good enough for children below 6 years.
Giving children excessive juice can lead to poor
nutrition, diarrhea, gas, abdominal pain, bloating, and tooth
Being acidic, they can cause acidity.
All of us know that Fruits are the best source of all type of
nutrients and vitamins that are necessory for proper growth
of our body and mind. We should eats fruits regularly to
make a balance of required nutrients in our body but we
should not exceed the limits. We should drink fruit juices
from good quality shops only which uses good quality of
fruits otherwise they can lead to many harmful diseases.
We should eat raw fruits to make the most of them.