applied le chatelieir's principle lesson 4
DESCRIPTION
Applied Le Chatelieir's Principle Lesson 4. Lab 19A Le Chatelier’s Principle Copy the five Equilibrium Equations into your lab handout. Part I. Thymol Blue (blue) + H + ⇌ Thymol Blue (yellow). Part II. Fe 3+ (aq) + SCN - (aq) ⇌ FeSCN 2+ (aq) yellow brown - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Applied Le Chatelieir's Principle Lesson 4](https://reader036.vdocuments.net/reader036/viewer/2022062301/568159d7550346895dc725b0/html5/thumbnails/1.jpg)
Applied Le Chatelieir's
Principle
Lesson 4
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Lab 19A
Le Chatelier’s Principle
Copy the five Equilibrium Equations into your lab handout
![Page 3: Applied Le Chatelieir's Principle Lesson 4](https://reader036.vdocuments.net/reader036/viewer/2022062301/568159d7550346895dc725b0/html5/thumbnails/3.jpg)
Part I
Thymol Blue (blue) + H+ ⇌ Thymol Blue (yellow)
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Fe3+(aq) + SCN-
(aq) ⇌ FeSCN2+(aq)
yellow brown
Fe3+(aq) + 3OH- → Fe(OH)3(s)
Part II
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Co(H2O)62+ + 2Cl- ⇌ Co(H2O)4Cl2
2- + 2H2O(l)
pink blue
Part III
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Energy + 2CrO42- + 2H+ ⇌ Cr2O7
2- + H2O(l)
yellow orange
Ba2+ + CrO42- →
BaCrO4(s)
Part IV
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Cu(H2O)42+ + 2NH3
⇌ Cu(OH)2(s) + 2NH4+ + 2H2O
light blue powder blue
Cu(OH)2(s) + 4NH3 ⇌ Cu(NH3)42+ + 2OH-
powder blue violet
Part V
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Application of Le Chatelier’s Principle
Energy + 2CrO42- + 2H+ ⇄ Cr2O7
2- + H2O(l)
yellow orangeKnow the following:
Any acid is H+
Any base is OH-
Acids react with bases H+ + OH- → H2O(l)
Stress Shift [CrO42-] [Cr2O7
2-] colour
Add H+
Add CrO42-
Add Cr2O72-
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Application of Le Chatelier’s Principle
Energy + 2CrO42- + 2H+ ⇄ Cr2O7
2- + H2O(l)
yellow orangeKnow the following:
Any acid is H+
Any base is OH-
Acids react with bases H+ + OH- → H2O(l)
Stress Shift [CrO42-] [Cr2O7
2-] colour
Add H+
Add CrO42-
Add Cr2O72-
![Page 10: Applied Le Chatelieir's Principle Lesson 4](https://reader036.vdocuments.net/reader036/viewer/2022062301/568159d7550346895dc725b0/html5/thumbnails/10.jpg)
Application of Le Chatelier’s Principle
Energy + 2CrO42- + 2H+ ⇄ Cr2O7
2- + H2O(l)
yellow orangeKnow the following:
Any acid is H+
Any base is OH-
Acids react with bases H+ + OH- → H2O(l)
Stress Shift [CrO42-] [Cr2O7
2-] colour
Add H+
Add CrO42-
Add Cr2O72-
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Application of Le Chatelier’s Principle
Energy + 2CrO42- + 2H+ ⇄ Cr2O7
2- + H2O(l)
yellow orangeKnow the following:
Any acid is H+
Any base is OH-
Acids react with bases H+ + OH- → H2O(l)
Stress Shift [CrO42-] [Cr2O7
2-] colour
Add H+ right decrease increase orange
Add CrO42-
Add Cr2O72-
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Application of Le Chatelier’s Principle
Energy + 2CrO42- + 2H+ ⇄ Cr2O7
2- + H2O(l)
yellow orangeKnow the following:
Any acid is H+
Any base is OH-
Acids react with bases H+ + OH- → H2O(l)
Stress Shift [CrO42-] [Cr2O7
2-] colour
Add H+ right decrease increase orange
Add CrO42- right increase increase ?
Add Cr2O72-
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Application of Le Chatelier’s Principle-1
Energy + 2CrO42- + 2H+ ⇄ Cr2O7
2- + H2O(l)
yellow orangeKnow the following:
Any acid is H+
Any base is OH-
Acids react with bases H+ + OH- → H2O(l)
Stress Shift [CrO42-] [Cr2O7
2-] colour
Add H+ right decrease increase orange
Add CrO42- right increase increase ?
Add Cr2O72- left increases increases ?
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Application of Le Chatelier’s Principle-1
Energy + 2CrO42- + 2H+ ⇄ Cr2O7
2- + H2O(l)
yellow orange
Acids react with bases H+ + OH- → H2O(l)
Stress Shift [CrO42-] [Cr2O7
2-] colour
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Application of Le Chatelier’s Principle-1
Energy + 2CrO42- + 2H+ ⇄ Cr2O7
2- + H2O(l)
yellow orange
Acids react with bases H+ + OH- → H2O(l)
Stress Shift [CrO42-] [Cr2O7
2-] colour
Add NaOH
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Application of Le Chatelier’s Principle-1
Energy + 2CrO42- + 2H+ ⇄ Cr2O7
2- + H2O(l)
yellow orange
Acids react with bases H+ + OH- → H2O(l)
NaOH → Na+ + OH-
Stress Shift [CrO42-] [Cr2O7
2-] colour
Add NaOH
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Application of Le Chatelier’s Principle-1
Energy + 2CrO42- + 2H+ ⇄ Cr2O7
2- + H2O(l)
yellow orange
Acids react with bases H+ + OH- → H2O(l)
NaOH → Na+ + OH-
spectator ion stress ion- lowers H+
Stress Shift [CrO42-] [Cr2O7
2-] colour
Add NaOH
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Application of Le Chatelier’s Principle-1
Energy + 2CrO42- + 2H+ ⇄ Cr2O7
2- + H2O(l)
yellow orange
Acids react with bases H+ + OH- → H2O(l)
NaOH → Na+ + OH-
spectator ion stress ion- lowers H+
Stress Shift [CrO42-] [Cr2O7
2-] colour
Add NaOH left increases decreases yellow
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Application of Le Chatelier’s Principle-1
Energy + 2CrO42- + 2H+ ⇄ Cr2O7
2- + H2O(l)
yellow orange
BaCrO4 has low solubilityBaCr2O7 has high solubility
Stress Shift [CrO42-] [Cr2O7
2-] colour
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Application of Le Chatelier’s Principle-1
Energy + 2CrO42- + 2H+ ⇄ Cr2O7
2- + H2O(l)
yellow orange
BaCrO4 has low solubilityBaCr2O7 has high solubility
Stress Shift [CrO42-] [Cr2O7
2-] colour
Ba(NO3)2
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Application of Le Chatelier’s Principle-1
Energy + 2CrO42- + 2H+ ⇄ Cr2O7
2- + H2O(l)
yellow orange
BaCrO4 has low solubility- Ba2+ reacts with CrO42-
BaCr2O7 has high solubility- no reaction
Ba(NO3)2 → Ba2+ + 2NO3-
Stress Shift [CrO42-] [Cr2O7
2-] colour
Ba(NO3)2
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Application of Le Chatelier’s Principle-1
Energy + 2CrO42- + 2H+ ⇄ Cr2O7
2- + H2O(l)
yellow orange
BaCrO4 has low solubilityBaCr2O7 has high solubility
Ba(NO3)2 → Ba2+ + 2NO3-
stress spectator
Stress Shift [CrO42-] [Cr2O7
2-] colour
Ba(NO3)2
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Application of Le Chatelier’s Principle-1
Energy + 2CrO42- + 2H+ ⇄ Cr2O7
2- + H2O(l)
yellow orange ↓ Ba2+ reacts with this ion
BaCrO4 has low solubilityBaCr2O7 has high solubility
Ba(NO3)2 → Ba2+ + 2NO3-
stress spectator
Stress Shift [CrO42-] [Cr2O7
2-] colour
Ba(NO3)2
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Application of Le Chatelier’s Principle-1
Energy + 2CrO42- + 2H+ ⇄ Cr2O7
2- + H2O(l)
yellow orange ↓ Ba2+ reacts with this ion
BaCrO4 has low solubilityBaCr2O7 has high solubility
Ba(NO3)2 → Ba2+ + 2NO3-
stress spectator
Stress Shift [CrO42-] [Cr2O7
2-] colour
Ba(NO3)2 left decreases decreases yellow
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Application of Le Chatelier’s Principle-1
Energy + 2CrO42- + 2H+ ⇄ Cr2O7
2- + H2O(l)
yellow orange
Stress Shift [CrO42-] [Cr2O7
2-] colour
HCl
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Application of Le Chatelier’s Principle-1
Energy + 2CrO42- + 2H+ ⇄ Cr2O7
2- + H2O(l)
yellow orange
HCl → H+ + Cl-
Stress Shift [CrO42-] [Cr2O7
2-] colour
HCl
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Application of Le Chatelier’s Principle-1
Energy + 2CrO42- + 2H+ ⇄ Cr2O7
2- + H2O(l)
yellow orange
HCl → H+ + Cl-
stress spectator
Stress Shift [CrO42-] [Cr2O7
2-] colour
HCl
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Application of Le Chatelier’s Principle-1
Energy + 2CrO42- + 2H+ ⇄ Cr2O7
2- + H2O(l)
yellow orange
HCl → H+ + Cl-
stress spectator
Stress Shift [CrO42-] [Cr2O7
2-] colour
HCl right decreases increases orange
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Application of Le Chatelier’s Principle- 2
Energy + Co(H2O)62+ + 2Cl- ⇄ Co(H2O)4Cl2
2- + 2H2O(l)
pink blue
Stress stress ion spectator ion shift colour
HCl
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Application of Le Chatelier’s Principle- 2
Energy + Co(H2O)62+ + 2Cl- ⇄ Co(H2O)4Cl2
2- + 2H2O(l)
pink blue
HCl → H+ + Cl-
Stress stress ion spectator ion shift colour
HCl
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Application of Le Chatelier’s Principle- 2
Energy + Co(H2O)62+ + 2Cl- ⇄ Co(H2O)4Cl2
2- + 2H2O(l)
pink blue
HCl → H+ + Cl-
spectator stress
Stress stress ion spectator ion shift colour
HCl
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Application of Le Chatelier’s Principle- 2
Co(H2O)62+ + 2Cl- ⇄ Co(H2O)4Cl2 + 2H2O(l)
pink blue
HCl → H+ + Cl-
spectator stress
Stress stress ion spectator ion shift colour
HCl Cl- H+ right blue
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Application of Le Chatelier’s Principle- 2
Energy + Co(H2O)62+ + 2Cl- ⇄ Co(H2O)4Cl2
2- + 2H2O(l)
pink blue
Stress stress ion spectator ion shift colour
Increase temperature
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Application of Le Chatelier’s Principle- 2
Energy + Co(H2O)62+ + 2Cl- ⇄ Co(H2O)4Cl2
2- + 2H2O(l)
pink blue
Stress stress ion spectator ion shift colour
Increase temperature
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Application of Le Chatelier’s Principle- 2
Energy + Co(H2O)62+ + 2Cl- ⇄ Co(H2O)4Cl2
2- + 2H2O(l)
pink blue
Stress stress ion spectator ion shift colour
↑ temp none none right blue
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Application of Le Chatelier’s Principle- 2
Energy + Co(H2O)62+ + 2Cl- ⇄ Co(H2O)4Cl2
2- + 2H2O(l)
pink blue
Stress stress ion spectator ion shift colour
AgNO3
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Application of Le Chatelier’s Principle- 2
Energy + Co(H2O)62+ + 2Cl- ⇄ Co(H2O)4Cl2
2- + 2H2O(l)
pink blue
AgNO3 → Ag+ + NO3-
Stress stress ion spectator ion shift colour
AgNO3
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Application of Le Chatelier’s Principle- 2
Energy + Co(H2O)62+ + 2Cl- ⇄ Co(H2O)4Cl2
2- + 2H2O(l)
pink blue
AgNO3 → Ag+ + NO3-
↑ stress- low solubility (data book-4) with Cl-
Stress stress ion spectator ion shift colour
AgNO3
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Application of Le Chatelier’s Principle- 2
Energy + Co(H2O)62+ + 2Cl- ⇄ Co(H2O)4Cl2
2- + 2H2O(l)
pink blue
AgNO3 → Ag+ + NO3-
↑ stress- low solubility (data book-4) with Cl-
Stress stress ion spectator ion shift colour
AgNO3 Ag+ NO3- left pink
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Here is a the first question from your lab. I will give you a good answer so that you understand the level of detail that is required in the response
1. Explain the colour changes observed when Fe(NO3)3, KSCN, and
NaOH were added to the thiocyanatoiron equilibrium system. Start by writing the equilibrium equation.
Fe3+(aq) + SCN-
(aq) ⇄ Fe(SCN)2+(aq)
yellow brown
Adding Fe(NO3)3 increases the [Fe3+] and causes the reaction to shift
right and turn brown. Adding KSCN increases the [SCN-] and causes the reaction to shift right and turn brown. Adding NaOH increases the [OH-] which reacts with Fe3+, lowering the [Fe3+] causing the equilibrium to shift left and turn yellow.