Water Testing Lab Report
6.25.13
Lithium: Nicolette, Makena, and Nina
Dr. Forman
Summer Chemistry
It’s
no myth, call us Lith.
Don’t stop pour
that drop, see that color change then stop. Get a table, write results, grab
your group and then consult. Are there ions, are there not, it interests me a
lot.
The Abstract
The purpose of the water testing lab is to test water and to learn about precipitate, and to detect if there are any ions present that are not visible. The water testing lab included four main steps, unlike the foul water lab which included three. The four main steps of the water testing lab are: the calcium ion test, the iron ion test, the chloride ion test, and the sulfate ion test. Each test included five different samples which included: the reference, the control, the tap water, the ocean water, and the distilled water. Some of the sources reacted when dropping ions into the substance, while others did not react. We then found out that ions were present in some of the samples, while they were not visible in the other samples. I feel like my group and I bond really well, and teamwork helped us get past the many obstacles that we came through.
Procedure
My group and I came through obstacles such as there being left over residue in our wash plates, causing our samples to turn pink. Other than that, we had a very smooth and great lab experience.
Calcium Ion Test
Place
20 drops of distilled water into a 24-well plate. Place 20 drops of reference solution (Ca
Chloride) into a 24-well plate. Place 20 drops of control
solution into a 24-well plate. Place 20 drops of Tap
water into a 24-well plate. Place 20 drops of Natural
water into a 24-well plate. Add 3 drops of sodium
carbonate test solution to each of the wells. Decide whether CA2+ cations
are present and record your results. Discard the contents of the well
plates and clean.
Iron (III) Ion Test
Place 20 drops of distilled water into a 24-well
plate. Place 20 drops of
reference solution (Ferric Nitrate) into a 24-well plate. Place 20 drops of control solution into a
24-well plate. Place 20 drops of Tap
water into a 24-well plate. Place 20 drops of Natural
water into a 24-well plate. Add one to two drops of
potassium thiocyanate test reagent to each of the wells. Decide whether
Fe3+ cations are present and record your results. Discard the contents of
the well plates and clean.
 |
| Before |
 |
| After |
Chloride Ion Test
Place
20 drops of distilled water into a 24-well plate. Place 20 drops of
reference solution (Ca Chloride) into a 24-well plate. Place 20 drops of control
solution into a 24-well plate. Place 20 drops of Tap water into a 24-well plate.Place 20 drops of
Natural water into a 24-well plate. Add 3 drops of silver nitrate test reagent to
each of the wells.Decide whether Cl- anions are present and record your
results. Discard the contents of the well plates and clean.
Sulfate Ion Test
Place 20 drops of
distilled water into a 24-well plate. Place 20 drops of reference solution
(Ferric Nitrate) into a 24-well plate. Place 20 drops of control
solution into a 24-well plate. Place 20 drops of Tap water into a 24-well
plate. Place 20 drops of Natural water into a 24-well plate. Add 3 drops of
barium carbonate test solution to each of the wells. Decide whether SO4^2-
anions are present and record your results. Discard the contents of
the well plates and clean.
Calcium Ion Test
Class Aggregated Data:
In our group, chloride and sulfate ions were present in the ocean water. In the class data, some groups had calcium ions present in the ocean water. In our group, sulfate ions were present in the control, but some groups in the class chloride and iron ions were present in the control. In all groups, calcium, iron, chloride, and sulfate were all present in the reference.
Lab Questions #1-4 p. 45
1. There was a reference solution and a blank used in each test so that you have something that you can use as a comparison.
2. Some problems associated with the use of qualitative tests are that you might have contaminants leftover in your wash plates.
3. These tests cannot absolutely confirm the absence of an ion because you may not be able to physically see the ions.
4. Our observations may have changed if we had not cleaned our wells or stirring rods thoroughly after each test in ways that our samples might turn pink or change color. My group and I experienced this change in color within our samples.
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