Question

G.C. 2-7: LABORATORY REPORT Name: Answer the following questions in your laboratory notebook in complete detail using Le chatelier's principle to explain and support your observations. Include the direction of the reaction shift in all answers. System No. 1: HC2H3O2(aq) ? H+(aq) + C2H3O2-(aq) Solutions | pH | Observation 0.1 M HC2H3O2 | 3 | Dark orange/ reddish color 0.1 M HC2H3O2 + NaC2H3O2 | 5 | light orange 1. Did the equilibrium shift and in which direction? 2. How did the pH of the solution change after adding NaC2H3O2 to it? (Hint: Identify which ion is being added to the solution and how it affects the concentration of other ions present in solution.) System No. 2: 2CrO4^2-(aq) + 2H+(aq) ? Cr2O7^2-(aq) + H2O(l) Solutions | Observations Na2CrO4 solution | yellow Na2CrO4 solution + HCl | orange Na2CrO4 solution + NaOH | yellow 3. Explain how the equilibrium shifted when you added HCl to the solution? 4. Which chromium ion is orange and which is yellow? How did you know? 5. How did the equilibrium shift when you added NaOH to the solution? (Hint: Think about what NaOH will react with and how that result will affect the other components present in the solution.) System No. 3: BiCl3(aq) + H2O(l) ? 2H+(aq) + BiOCl(s) + 2Cl-(aq) Solutions | Observations BiCl3 mixed with water | milky white w/ ppt forming Mixture plus HCl | clear with white ppt Mixture diluted with water | cloudy white liquid 6. Explain how the equilibrium shifted when you dissolved the BiCl3 in excess water. 7. Explain how the equilibrium shifted after the addition of HCl. 8. Explain how the equilibrium shifted after dilution.

          G.C. 2-7: LABORATORY REPORT
Name:
Answer the following questions in your laboratory notebook in complete detail using Le chatelier's principle to explain and support your observations. Include the direction of the reaction shift in all answers.
System No. 1: HC2H3O2(aq) ? H+(aq) + C2H3O2-(aq)
Solutions | pH | Observation
0.1 M HC2H3O2 | 3 | Dark orange/ reddish color
0.1 M HC2H3O2 + NaC2H3O2 | 5 | light orange
1. Did the equilibrium shift and in which direction?
2. How did the pH of the solution change after adding NaC2H3O2 to it? (Hint: Identify which ion is being added to the solution and how it affects the concentration of other ions present in solution.)
System No. 2: 2CrO4^2-(aq) + 2H+(aq) ? Cr2O7^2-(aq) + H2O(l)
Solutions | Observations
Na2CrO4 solution | yellow
Na2CrO4 solution + HCl | orange
Na2CrO4 solution + NaOH | yellow
3. Explain how the equilibrium shifted when you added HCl to the solution?
4. Which chromium ion is orange and which is yellow? How did you know?
5. How did the equilibrium shift when you added NaOH to the solution? (Hint: Think about what NaOH will react with and how that result will affect the other components present in the solution.)
System No. 3: BiCl3(aq) + H2O(l) ? 2H+(aq) + BiOCl(s) + 2Cl-(aq)
Solutions | Observations
BiCl3 mixed with water | milky white w/ ppt forming
Mixture plus HCl | clear with white ppt
Mixture diluted with water | cloudy white liquid
6. Explain how the equilibrium shifted when you dissolved the BiCl3 in excess water.
7. Explain how the equilibrium shifted after the addition of HCl.
8. Explain how the equilibrium shifted after dilution.

G.C. 2-7: LABORATORY REPORT
Name:
Answer the following questions in your laboratory notebook in complete detail using Le chatelier's principle to explain and support your observations. Include the direction of the reaction shift in all answers.
System No. 1: HC2H3O2(aq) ? H+(aq) + C2H3O2-(aq)
Solutions | pH | Observation
0.1 M HC2H3O2 | 3 | Dark orange/ reddish color
0.1 M HC2H3O2 + NaC2H3O2 | 5 | light orange
1. Did the equilibrium shift and in which direction?
2. How did the pH of the solution change after adding NaC2H3O2 to it? (Hint: Identify which ion is being added to the solution and how it affects the concentration of other ions present in solution.)
System No. 2: 2CrO4^2-(aq) + 2H+(aq) ? Cr2O7^2-(aq) + H2O(l)
Solutions | Observations
Na2CrO4 solution | yellow
Na2CrO4 solution + HCl | orange
Na2CrO4 solution + NaOH | yellow
3. Explain how the equilibrium shifted when you added HCl to the solution?
4. Which chromium ion is orange and which is yellow? How did you know?
5. How did the equilibrium shift when you added NaOH to the solution? (Hint: Think about what NaOH will react with and how that result will affect the other components present in the solution.)
System No. 3: BiCl3(aq) + H2O(l) ? 2H+(aq) + BiOCl(s) + 2Cl-(aq)
Solutions | Observations
BiCl3 mixed with water | milky white w/ ppt forming
Mixture plus HCl | clear with white ppt
Mixture diluted with water | cloudy white liquid
6. Explain how the equilibrium shifted when you dissolved the BiCl3 in excess water.
7. Explain how the equilibrium shifted after the addition of HCl.
8. Explain how the equilibrium shifted after dilution.

Added by Michael P.

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