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Experiment Design

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Subject
Chemistry
Type
Homework
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The experimental design planned to evaluate the enthalpy of the reaction through the Le Chatelier
principle is as follows:
1. Weigh 1.0 grams of Co(H
2
O)
6
Cl
2
(xx)
2. Solve this solid into 100 ml of distilled water (xx)
3. Weigh 0.5 grams of NaCl (xx)
4. Solve this solid with 50 ml of distilled water (xx)
5. Mix 25 ml of the solutions prepared in steps 2 and 4 and record the color on the notebook.
(xx)
6. Take an aliquot of 20 ml of the reaction mixture prepared in step 5 and heat it with the
help of the hot plate. Record any color changes observed (xx)
7. Take an aliquot of 20 ml of the reaction mixture prepared in step 5 and cool it by placing it
for 45-60 minutes. Record any color changes observed (xx)
I have selected this reaction because it is easy to follow the reaction yield through a color change
since the solution of the reagents is red, while that of the products is blue. The reaction taking
place can be written as:
Co(H
2
O)
6
2+
+ 4Cl
-
CoCl
4
2-
+ 6H
2
O
Where the species responsible from the color are marked in the color of their respective solutions.
Considering that this is an endothermic reaction, I expect that a decrease of temperature (as in
step 7) will increase the concentration of the reagents such that the solution will turn bright red.
On the contrary, an increase in the temperature (as done in step 6) should increase the
concentration of the products, therefore turning the solution purple-blue.
To do this experiment I will need the following material:
- Balance (to weigh the solid salts)
- Volumetric material (to prepare the solutions)
- Fridge (to decrease the temperature)
- Hot plate (to increase the temperature)

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The experimental design planned to evaluate the enthalpy of the reaction through the Le Chatelier principle is as follows: 1. 2. 3. 4. 5. Weigh 1.0 grams of Co(H2O)6Cl2 (xx) Solve this solid into 100 ml of distilled water (xx) Weigh 0.5 grams of NaCl (xx) Solve this solid with 50 ml of distilled w ...
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