Lab Report Worksheet: How Can Chemical Equilibrium be
Manipulated?
Lab Section (or Day-Time) and Group Number: Thurs. 12:30 Group 4
Due Date: 4/18/19
Names: Juan Moreno Lydna, Brian Nguyen, Derrick Pierce
This worksheet does not replace good lab notebook keeping!
ALL INFORMATION RECORDED ON THIS WORKSHEET
SHOULD COME FROM THE BOOK, PRELAB NOTES, THE LAB MANUAL AND
PROCEDURES/VALUES/CALCULATIONS YOU HAVE RECORDED IN YOUR
NOTEBOOK!
1. Initial Equilibrium Mixtures:
Description of Initial Reactants Description of Give the ion(s)
Equilibrium Mixture: present in the
equilibrium mixture
causing the
observed color:
CuSO4(aq): KBr(aq): Light blue SO₄²⁻
Part 1:
blue clear
FeCl3(aq): NH4SCN(aq): orange NH₄⁺
Part 2:
orange clear
Part NH3(aq): H2O(l): Before indicator: pink NH₃⁺
3:
clear clear After indicator:
clear
CH3COOH(aq) H2O(l): Before indicator: CH₃COO⁻
Part 4: pinkish-red
clear clear
After indicator:
lighter orange
This study source was downloaded by 100000850872992 from CourseHero.com on 02-14-2023 22:41:44 GMT -06:00
https://www.coursehero.com/file/54909439/Lab-10-worksheetdocx/
, 2. Fill out the following table of observations for Part 1.
What Identify which Describ Which way does the As a result of the
was component of the e how reaction shift as a shift,which
the equilibrium the result of the applied reaction species
experi reaction was color of stress? changed, resulting
added↑ or the right (forward) or left in the observed
mental
removed↓ as a equilibri (reverse) color change?
stress
result of the um Indicate whether
or mixture it increased↑ or
applied stress.
reagen changed decreased↓.
t after
added the
? (give applied
reagen stress.
t used
or
describ
e
stress)
Net Ionic
Reaction Cu²⁺(aq) + 4Br⁻(aq) ⇄ CuBr₄²⁻(aq)
Part 1:
Stre Hot Heat added Darker right CuBr₄²⁻
ss i. water blue increased
Stre Cold Heat removed Lighter left Cu²⁺ and Br⁻
ss water blue decreased
ii.
3. Is the reaction in Part 1 endothermic or exothermic in the forward direction? (It can’t
be both!) Explain based on your observations for the hot and cold baths.
The reaction is endothermic because when heat is removed, it turns lighter, which
means the products are converted back into reactants; when heat is gained, it turns
darker, which means the products are being produced exponentially.
4. Fill out the following table of observations for Parts 2, 3, and 4.
What Identify which Describe Which way does the As a result of the
This study source was downloaded by 100000850872992 from CourseHero.com on 02-14-2023 22:41:44 GMT -06:00
https://www.coursehero.com/file/54909439/Lab-10-worksheetdocx/
Manipulated?
Lab Section (or Day-Time) and Group Number: Thurs. 12:30 Group 4
Due Date: 4/18/19
Names: Juan Moreno Lydna, Brian Nguyen, Derrick Pierce
This worksheet does not replace good lab notebook keeping!
ALL INFORMATION RECORDED ON THIS WORKSHEET
SHOULD COME FROM THE BOOK, PRELAB NOTES, THE LAB MANUAL AND
PROCEDURES/VALUES/CALCULATIONS YOU HAVE RECORDED IN YOUR
NOTEBOOK!
1. Initial Equilibrium Mixtures:
Description of Initial Reactants Description of Give the ion(s)
Equilibrium Mixture: present in the
equilibrium mixture
causing the
observed color:
CuSO4(aq): KBr(aq): Light blue SO₄²⁻
Part 1:
blue clear
FeCl3(aq): NH4SCN(aq): orange NH₄⁺
Part 2:
orange clear
Part NH3(aq): H2O(l): Before indicator: pink NH₃⁺
3:
clear clear After indicator:
clear
CH3COOH(aq) H2O(l): Before indicator: CH₃COO⁻
Part 4: pinkish-red
clear clear
After indicator:
lighter orange
This study source was downloaded by 100000850872992 from CourseHero.com on 02-14-2023 22:41:44 GMT -06:00
https://www.coursehero.com/file/54909439/Lab-10-worksheetdocx/
, 2. Fill out the following table of observations for Part 1.
What Identify which Describ Which way does the As a result of the
was component of the e how reaction shift as a shift,which
the equilibrium the result of the applied reaction species
experi reaction was color of stress? changed, resulting
added↑ or the right (forward) or left in the observed
mental
removed↓ as a equilibri (reverse) color change?
stress
result of the um Indicate whether
or mixture it increased↑ or
applied stress.
reagen changed decreased↓.
t after
added the
? (give applied
reagen stress.
t used
or
describ
e
stress)
Net Ionic
Reaction Cu²⁺(aq) + 4Br⁻(aq) ⇄ CuBr₄²⁻(aq)
Part 1:
Stre Hot Heat added Darker right CuBr₄²⁻
ss i. water blue increased
Stre Cold Heat removed Lighter left Cu²⁺ and Br⁻
ss water blue decreased
ii.
3. Is the reaction in Part 1 endothermic or exothermic in the forward direction? (It can’t
be both!) Explain based on your observations for the hot and cold baths.
The reaction is endothermic because when heat is removed, it turns lighter, which
means the products are converted back into reactants; when heat is gained, it turns
darker, which means the products are being produced exponentially.
4. Fill out the following table of observations for Parts 2, 3, and 4.
What Identify which Describe Which way does the As a result of the
This study source was downloaded by 100000850872992 from CourseHero.com on 02-14-2023 22:41:44 GMT -06:00
https://www.coursehero.com/file/54909439/Lab-10-worksheetdocx/
