chemistry-project.pdf project files class 11

GshsvsjshshsbhsishsjshsjsbsjbsvshshsvdudvdhdjsbshdgshsvhshsvshsbsvshdbbdvdjdbdhdhdhdhdjdbdjdbvdjsbshsishhsisbsjhsgshwivsGshsvsjshshsbhsishsjshsjsbsjbsvshshsvdudvdhdjsbshdgshsvhshsvshsbsvshdbbdvdjdbdhdhdhdhdjdbdjdbvdjsbshsishhsisbsjhsgshwivsGshsvsjshshsbhsishsjshsjsbsjbsvshshsvdudvdhdjsbshdgshsvhshsvshsbsvshdbbdvdjdbdhdhdhdhdjdbdjdbvdjsbshsishhsisbsjhsgshwivsGshsvsjshshsbhsishsjshsjsbsjbsvshshsvdudvdhdjsbshdgshsvhshsvshsbsvshdbbdvdjdbdhdhdhdhdjdbdjdbvdjsbshsishhsisbsjhsgshwivs

1. Chemistry project
chemistry (Kendriya Vidyalaya Hebbal)
Scan to open on Studocu
Studocu is not sponsored or endorsed by any college or university
Chemistry project
chemistry (Kendriya Vidyalaya Hebbal)
Scan to open on Studocu
Studocu is not sponsored or endorsed by any college or university
Downloaded by Abhinav Verma ([email protected])
lOMoARcPSD|43699115

2. CERTIFICATE
This is to certify that this project on the topic
checking the bacterial contamination of drinking
water by testing sulphide ion has been
successfully completed and submitted by Aditya
Kumar Singh of Class XI during the session
2022-23 under the guidance and supervision of
Mrs. Seema Bhalla to the Department of
Chemistry.
Date: 12-11-2022

Internal Examiner External
examiner
Downloaded by Abhinav Verma ([email protected])
lOMoARcPSD|43699115

3. Principal
ACKNOWLEDGEMENT
I would like to express my special thanks of
gratitude to my chemistry teacher Mrs. Seema
Bhalla for her able guidance and support in
completing my project.
I would also like to extend my gratitude to
Principal Ma’am Mrs. Kiran Devi for providing me
with all the facilities that were required. I am
also very thankful to my parents who helped me in
my investigatory project, without whose
motivation and help the completion of this project
would not have been possible.
Aditya Kumar Singh…
Downloaded by Abhinav Verma ([email protected])
lOMoARcPSD|43699115

4. CONTENTS
i) INTRODUCTION
ii) AIM
iii) REQUIREMENTS
iv) PROCEDURE
v) OBSERVATION
vi) RESULT
vii) CONCLUSIONS
viii) PRECAUTIONS
ix) BIBLIOGRAPHY
Downloaded by Abhinav Verma ([email protected])
lOMoARcPSD|43699115

5. INTRODUCTION
The sulphide ion test for bacterial contamination
is good. In surface waters, hydrogen sulphide is
formed under oxygen deficient conditions.
Hydrogen sulphide is also produced from the
decomposition of sulphur containing organic
compounds. The concentration of sulphide ion
becomes significant only at pH 10 or above.
Under acidic conditions, the concentration of
hydrogen sulphide predominates. Hydrogen
sulphide is a weak acid, which ionizes to yield
hydrosulphide (HS) and sulphide (S2) ions.
Hydrogen sulphide is highly toxic to fish.
Concentrations of total sulphide as low as 0.01
mg/L make the water uninhabitable for fish
culture. Hydrogen sulphide also reduces the
aesthetic value of the water body due to foul
Downloaded by Abhinav Verma ([email protected])
lOMoARcPSD|43699115

6. color. The bacterial contamination can be tested
using H2S strip.
Presence of pathogenic bacteria in water can be
detected by testing the sulphide content of
water. The presence of sulphide ions in water is an
indicator of: i) High pH above 10. ii) Sulphide
producing bacteria. iii) Diminished oxygen
concentrations.
Conducting the sulphide ion test :- The sulphide
ion test is conducted using a Hydrogen sulphide
strip (H S) - The H S strip is dipped into the₂ ₂
water to be tested for 14 to 16 hours. - The H S₂
strip turns black if sulphide ions are present in
the water. The black color is due to the ionization
of the H S.₂
Downloaded by Abhinav Verma ([email protected])
lOMoARcPSD|43699115

7. AIM
To test the contamination of drinking water by
bacteria by checking the sulphide ion
concentration and find out the cause of
contamination.
Downloaded by Abhinav Verma ([email protected])
lOMoARcPSD|43699115

8. REQUIREMENTS
Apparatus Required
i) Hydrogen Sulphide (H 2S strip)
ii)Beaker
iii)Drinking Water
iv)Thermometer
Chemicals Required
i) Hydrogen Sulphide (H 2S)
Downloaded by Abhinav Verma ([email protected])
lOMoARcPSD|43699115

9. PROCEDURE
This experiment is to be done in an incubator.
 Add about 250ml of water in a beaker
 Dip the H2S strip in the beaker with water.
 Heat the beaker for about 35 degree
centigrade.
 Check the temperature (temperature should
be at 35 degrees centigrade).
 Keep it in incubator for 14-16 hours of time.
 Check the result if the water turns black
then
it is unfit for drinking / highly contaminated
for drinking or for human use.
 The sulphide ion test for bacterial
contamination is good. In surface waters,
hydrogen sulphide is formed under oxygen-
deficient conditions. Hydrogen sulphide is also
produced from the decomposition of sulphur
Downloaded by Abhinav Verma ([email protected])
lOMoARcPSD|43699115

10. containing organic compounds. The
concentration of sulphide ion becomes
significant only at pH 10 or above.

Downloaded by Abhinav Verma ([email protected])
lOMoARcPSD|43699115

11. OBSERVATION
Source of Water Result
Water from the tap of
houses in my locality
Water is fit for
drinking.
Water from the public
handpump
Water is unfit for
drinking.
Spring Water Water is fit for
drinking
River Water Water is not fit for
drinking
Downloaded by Abhinav Verma ([email protected])
lOMoARcPSD|43699115

12. RESULT
By the experiment done the result says that at
some place water is fit for drinking whereas it is
unfit for drinking at some places. Especially water
is unfit for drinking from river bodies.
Downloaded by Abhinav Verma ([email protected])
lOMoARcPSD|43699115

13. CONCLUSION
 Water is mostly unfit for drinking from
river.
 Water that come to houses is also unfit for
drinking at some of the places.

 Therefore, we should purify the water
before
drinking. And we should not drink water from
random sources.
Downloaded by Abhinav Verma ([email protected])
lOMoARcPSD|43699115

14. PRECAUTIONS
 Use same volume of water sample from
different sources.
 Same quantity of reagent should be used for
different samples.
 Do not taste the water sample.
Downloaded by Abhinav Verma ([email protected])
lOMoARcPSD|43699115

15. BIBLIOGRAPHY
i) Chemistry Lab Manual
ii) www.brainly.in
iii) www.quora.com
iv) www.ncert.nic.in
v) www.coursera.com
Downloaded by Abhinav Verma ([email protected])
lOMoARcPSD|43699115