💻💹📙📗📘📚 Kvabghi Public School students conducted trials and tested three different water samples, one of the three samples being rural school drinking water, one sample being store-bought drinking water and one sample being Tkibuli city water. After testing all three samples, students determined that only two of the three samples were drinkable.This is the boiler school drinking water and store water.
Private Aliağa Science Schools /Özel Aliağa Fen Bilimleri Okulları
General evaluation rubric of the experiment
|
Tasks |
Expected
result |
Evaluation
form |
|
I introduced the project goal and action plan I have given clear instructions to work successfully on ETWVINIG I was first reminded of the safety rules when
working in a lab; |
Students' interest in the project, introduction
to the goal and action plan. |
Observation |
|
6 students from Kvabghi Public School
participate in the project, their academic attendance level is high. This time too I took into account their
capabilities and the project was planned according to their thinking skills. I first interviewed everyone to test the
students' knowledge and their personal attitudes around the issue. It turned out that they think rural water is
one of the best waters in Georgia. |
Students will understand the essence of the
project and will be interested in their issue. They will be actively involved
in the trial planning process and job redistribution. |
Observation
|
|
Students have to work in groups, in pairs,
individually. They have redistributed functions - they master different
programs, through which they create different digital products. Process the information in the textbook and
plan experiments using school-based reagents. Based on the tests conducted and the
information obtained, they will discuss the cleanliness of the water in the
village, how to protect it and how to prevent pollution. The next step will be to practice and present
in the form of a presentation |
They will process the prepared information and
prepare a presentation. They will work both individually and in a group and
present the results. They will make presentations.
The student gets used to planning the experiment, will find the
resource he / she wants, observe and make notes. |
Observation, developmental assessment made
after reviewing the information retrieved |
Name, Surname: Inga Beridze, Jambuli Dumbadze
Test Time: 31 May 2021
Number of samples: 1
Test sample: # 1
Test report
Sample
Determination of weighted particles
Determination of coloration
The smell
Hydrogen index -PH
Determination of chlorides
Determination of sulfates
Determination of iron ions
Determination of copper ions
Determination of lead content
#1
Are weighted particles
Slightly has color
Has an odor of unknown origin
It has a light yellow color
Slightly spilled
No color has changed
No color has changed
No color has changed
Slightly changed color, has a light yellowish color as if
Description: Hello, I am Inga Beridze from the village of Kvabghi, Chokhatauri Municipality, an eleventh grade student.
On May 31, 2021, my friend Jambul Dumbadze and I worked as a couple, conducting tests to check the purity of the water to see if it was fit for drinking. Our test water was sample # 1
First attempt:
What does water purity control mean?
Odor- Odor is caused by the presence of various odorous substances which enter it naturally or under the influence of the natural waters of the enterprise.
We took water and inhaled it and found that it smelled very faint, but we could not distinguish what that smell might be.
Transparency - We took a flat-bottomed measuring cylinder 30 cm high (we did not have a 60 cm measuring cylinder) with a diameter of about 2.5 cm, poured water into it, stood on a white sheet and placed it 4 cm from the bottom of the cylinder.
The height of the letters of the font is 2.5 mm .We put water in the cylinder before this writing appeared, we measured the height of the water column with a line, its transparency was more than 3 cm, we usually saw the inscription, it means that our water is transparent.
Accordingly there is no violation in this characteristic.
Determining the color - we took a glassware and a sheet of white paper. We put our sample in the pot and set the water color on a white paper background. Our water had a slightly grayish color.
Weighted particles - for analysis we took 500 ml of water, pre-weighed filter paper (filter paper was weighed on a laboratory scale, its mass was 0.9 g. We filtered water through filter paper, dried and weighed again.
The mass changed to 1.0.
Put it in the formula >> (m1-m2)*1000/V
(1.0-0.9)*1000/500 =0.2 mg/l
The result shows that: there are weighted particles in water, but not in large quantities, and the maximum allowable weight of particles is 10 mg / l.
Determination of water quality according to chemical analysis
The hydrogen indicator-drinking water must have a neutral reaction. This means that its pH should be about seven. The change in the hydrogen content of water intended for agricultural, drinking and household consumption is regulated in the following limits 6.5-8.5.Pour 5 ml of drinking water into a test tube, add 0.1 ml of universal indicator, stir, the color is very, very light yellow. The pH of this sample is probably 6-6.5.
Chloride determination - Permissible concentration of chlorides in water supply system is up to 350 mg / l
We took 5 ml of test water and added a few drops, about 3-5 drops of silver nitrate.
The water changed color slightly, it spilled very weakly. Accordingly, if we look at the table given on the flipchart, it is a weak spill and the concentration of chlorides was 1-10.
Accordingly, there are chlorides in the water, but not more than the permissible amount, and in this regard, the water is suitable for drinking.
Determination of sulphates - To test for sulphates we took 10 ml of test water, 0.5 ml of hydrochloric acid and 2 ml of 5% solution of barium chloride, after stirring the solution we determined that there were no sulphates in the water.Because neither the color changed, no precipitation formed.The conclusion is that the concentration of sulfates is less than 5 mg / l.
Determination of iron ions- The permissible norm of iron ions is 0.3 mg.
Pour 10 ml of test water into a test tube, add 15 drops of concentrated nitric acid, a few drops of hydrogen peroxide and 0.5 ml of potassium rodent solution.
Neither in this case did any change in color or precipitation occur, so we conclude that there are no iron ions in our water sample.
Determination of copper ion content - The permissible norm of copper ions in water is 0.1 mg.
Place 3 ml of test water in a porcelain vessel, evaporate using alcohol until it dries, left as a stain, add one drop of concentrated ammonia solution, the color does not change.
Accordingly, we conclude that there are no copper ions in our water sample.
Conclusion
Based on the above, our couple, eleventh grade students Inga Beridze and Jambuli Dumbadze, believe that the sample we tested should not be fit for drinking because of the weighted particles, color and odor, it can still be contaminated chemically or biologically, although chlorides are permissible. Normally, sulfates, copper ions were not found.But we think there must be a small amount of lead in the water because after the addition of potassium iodide the water got a yellowish color as if.
It would be better if this water is tested and then used for drinking. Otherwise we would not recommend this water, or in extreme cases it should be filtered before consumption at home, boiling because the weight of the filter paper has increased when checking the weighed particlesThe teacher told us that it was Tkibuli water that was not suitable for drinking. We also think that the experiments conducted by us correspond exactly to the obtained results and the water of Tkibuli is not suitable for drinking.
Inga Beridze
Jambuli Dumbadze
Name, Surname: Nazi Iremadze, Tamta Paichadze
Test time: 31.05
Number of samples: 1
Sample: # 2
Test report
ნიმუში
Determination of weighted particles
Determination of coloration
The smell
Hydrogen index -PH
Determination of chlorides
Determination of sulfates
Determination of iron ions
Determination of copper ions
Determination of lead content
#1
#2
0,9
does not have
does not have
The color got very light green
The color has changed
The solution is diluted
Did not change color
Did not change color
Did not change color
#3
Description: I, Nazi Iremadze, conducted an experiment with Tamta Paichadze on 31.05 to determine the purity of the water.
There were three samples in total. Initially we started to test the water with organoleptic characteristics. That is, it was color, odor, transparency, weighted particles.
Weighted particles were in the sample for this we weighed the filter paper on a small laboratory scale, the mass of the filter paper was 0.9 g, I filtered the water and took the filter paper sample to dry in the classroom, after re-weighing the filter paper mass did not change again and , 9 g.
The next characteristic we had to taste was the smell, the color and the transparency.
We checked the odor as a result of the odor and there was no odor in our sample.
We determined by eye that the water had no color to determine the color of the sample, we took the test solution, put it in a glass cylinder, stood on a sheet of white xerox and observed that the water is perfectly colorless, our sample had no odor and is very transparent.
Determination of water quality by chemical analysis methods
Pour 5 ml of test water and 0.1 ml of indicator into the pH-tube of the hydrogen tube, stir in the test tube and observe the color of the water as if it had taken on a light green color.
Determination of chlorides - Determination of chlorides - 5 ml of test water was removed from the sample by means of a plastic pipette, 3-4 drops of silver nitrate were added.
We will notice that the color has changed, slightly faded.
Determination of sulfates - Using the table we found that the concentration of chlorides is up to 1-10 mg / l.
Determination of sulfates - Now add 10 ml of test water to 0.5 ml of hydrochloric acid and 2 ml of barium chloride solution, stir in a test tube. Suddenly there was no turbidity, when we put it in the test tubes and started working on the next test, we soon noticed that the solution was spilled.If we compare the sulfate concentration with the characteristics given in the table, it should be 5-10 mg / l in this sample.
Determination of iron ions-To 15 ml of test water add 15 drops of nitric acid, a few drops of hydrogen peroxide and 0.5 ml of potassium rhodanide solution. The water has not changed color and does not contain iron ions.
Determination of copper ions-Place 2 ml of our sample on a small amount of porcelain, remove, stain and add a concentrated ammonia solution.The color has not changed accordingly does not contain copper ions.
Determination of lead - We took 5 ml of our sample and added potassium dioxide, we observed that the solution did not change color.
C o n c l u s i o n
Testing organization - Kvabghi Public School
Chemists - ninth and tenth grade students Tamta Paichadze and Nazi Iremadze.
Based on our analysis, we can conclude that the water is clean and drinkable.
Whereas:
1. It is odorless, colorless, transparent and does not contain weighted particles.
2.ph - we think that the pH of the water should be 6.5 -7, ie it should have a neutral area. Which is good for drinking
3. Although the sample changed color during the determination of chlorides did not exceed the permissible norm.
4. During the determination of sulfates, the solution was spilled, but even here it is not dangerous, because 5-10 mg / l is the permissible norm. Content above 100 mg / l and more is not allowed.
5. As for the detection of metal ions such as copper, iron and lead, none of them were found in our sample and therefore this water is completely suitable for drinking.
Our sample turned out to be store-bought water "Sno", while observing on the label we found that it is hydrocarbonate calcium type water, non-carbonated.Contains cations and anions. From cations Ca +2, Mg + 2, K +, Na +, from anions HCO3 -, Cl -, SO4-2, NO3-.
Where: Cl - <15, SO4-2 16-25, NO3- <50.Chlorides and sulphates tested by us match the one indicated on the label.
Also the pH value is 6.5-8.5. We assumed that water has a pH of 6.5.
Комментариев нет:
Отправить комментарий