General Chemistry II Lab (CHEM 1108): Pre-Lab
CRN: 25498
Name: Tyrese Butler
Date: 10/04/21
Lab partner’s name: Jasmine Rodriguez, Rene Marcial or Daren Hamilton
Experiment number: 616
Experiment title: Introducing Chemical Equilibrium
Purpose (one sentence): The purpose for this laboratory experiment is to observe the effects of
disturbances on three chemical systems at equlibrium and examine these effects in relation to Le
Châtelier’s principle.
Chemical Reactions (if any):



HC2H3O2 + H2O ↔ C2H3O2- + H3OCoCl42- + H2O ↔ Co(H2O)62+ + ClNH4Cl ↔ NH4+ + Cl-
Equipment and Glassware (use the table below)
Equipment
Beaker
Ring
Ring Stand
Hot Plate
Test Tubes
Purpose
A beaker in this laboratory experiment was
used to obtain different test tubes with several
solutions for evaluation and prepare a hot
water bath and ice water bath to determine the
state of equilibrium in relation to Le
Châtelier’s principle.
A ring in this laboratory experiment was
utilized to support my apparatus above the
work surface and stabilize the beaker while
sitting on a hot plate.
A ring stand in this laboratory experiment
was used to hold a beaker in place during an
experimental procedure for a determination of
equilibrium.
A hot plate in this laboratory experiment was
utilized to perform a determination for
equilibrium with the constant color change of
sodium acetate and acetic acid.
A test tube in this laboratory experiment was
used to dispense out acetic acid, sodium
acetate, ethanol, cobalt (II) chloride,
hydrochloric acid, distilled water and
ammonium chloride for mixing with a glass
stirring rod in different sections throughout
this laboratory experiment.
A micro spatula was utilized in this
laboratory experiment to ensure a sample of
small amounts of solution is being dispensed
accurately to the state of equilibrium in
relation to Le Châtelier’s principle.
A glass stirring rod in this laboratory
experiment was used to mix chemicals and
liquids for laboratory purposes for a
determination of equilibrium.
A test tube holder in this laboratory
experiment was utilized to properly secure
test tubes during a chemistry demonstration
for chemical equilibrium.
A thermometer in this laboratory experiment
was used to measure the temperature in
Celsius or Fahrenheit for the temperature
change in the dissolution of an ammonium
chloride solid.
Micro Spatula
Glass Stirring Rod
Test Tube Holder
Thermometer
Chemical Table:
Chemical
Name
Chemical
Formula
Molar
Mass
Distilled Water
H2O
18.015
g/mol
Ethanol
C2H6O
46.069
g/mol
Cobalt (II) Chloride
CoCl2
129.839
g/mol
Safety Hazards
Personal
Protection
Equipment
- Non- Safety Googles
Hazardous
- Lab Coat
- Closed-toed
Shoes
- Disposable
Gloves
- Long Pants
- Skin Corrosion - Safety Googles
- Respiratory
- Lab Coat
Tract Infection
- Closed-toed
- Flammable
Shoes
Liquid or Vapor
- Disposable
Gloves
- Long Pants
- Skin Corrosion - Safety Googles
- Skin Irritation
- Lab Coat
- Eye Irritation
- Closed-toed
Shoes
- Fatal
Respiratory
Tract Infection
- Skin Corrosion
- Skin Irritation
- Eye Irritation
- Respiratory
Tract Infection
- Flammable
Liquid or Vapor
- Skin Corrosion
- Skin Irritation
- Eye Irritation
- Respiratory
Tract Infection
Acetic Acid
HC2H3O2
60.052
g/mol
Sodium Acetate
NaC2H3O2
82.034
g/mol
Methyl Orange
C14H14N3NaO3S
327.33
g/mol
- Oral Acute
Toxicity
- Respiratory
Tract Infection
Hydrochloric Acid
HCl
36.458
g/mol
- Skin Corrosion
- Skin Irritation
- Eye Irritation
- Respiratory
Tract Infection
Ammonium Chloride
NH4Cl
53.491
g/mol
Skin Corrosion
- Skin Irritation
- Eye Irritation
- Respiratory
Tract Infection
- Oral Acute
Toxicity
- Disposable
Gloves
- Long Pants
- Safety Googles
- Lab Coat
- Closed-toed
Shoes
- Disposable
Gloves
- Long Pants
- Safety Googles
- Lab Coat
- Closed-toed
Shoes
- Disposable
Gloves
- Long Pants
- Safety Googles
- Lab Coat
- Closed-toed
Shoes
- Disposable
Gloves
- Long Pants
- Safety Googles
- Lab Coat
- Closed-toed
Shoes
- Disposable
Gloves
- Long Pants
- Safety Googles
- Lab Coat
- Closed-toed
Shoes
- Disposable
Gloves
- Long Pants
Procedure (provide a stepwise protocol below):
1. Assemble the laboratory experiment with the necessary equipment such as a beaker, a ring, a
ring stand, a hot plate and an ice water bath to conduct and determine the state of equilibrium
during the effect in relation to Le Châtelier’s principle.
2. Studying the dissociation of HC2H3O2 in water equilibrium with two 15 x 125 mm test tubes, a
methyl orange solution, distilled water, sodium acetate, a micro spatula, a hot water bath, a glass
stirring rod, a hot plate and an ice water bath to determine the state of equilibrium during this
portion of the laboratory experiment. Also, throughout the chemistry demonstration, my group
and I will be observing and recording data to ensure our determination in this experiment is
accurate and precise.
3. Studying the [CoCl4]2- / [Co(H2O)6]2+ equilibrium with one 15 x 125 mm test tube, distilled
water, hydrochloric acid, a hot water bath, a glass stirring rod, a hot plate and an ice water bath
to determine the state of equilibrium during this effect in relation to Le Châtelier’s principle.
Also, throughout the chemistry demonstration, my group and I will be observing and recording
data to ensure our determination in this experiment is accurate and precise.
4. Studying the dissolution of NH4Cl in water equilibrium with one 15 x 125 mm test tube,
ammonium chloride, hydrochloric acid, a hot water bath, a hot plate, a micro spatula, a
thermometer, a second 15 x 125 mm test tube, distilled water and an ice water to determine the
state of equilibrium during this last portion of the laboratory experiment. Also, throughout the
chemistry demonstration, my group and I will be observing and recording data to ensure our
determination in this experiment is accurate and precise.
Waste Disposal: Discard and pour the contents of solution in both test tubes into a designated
container inside the chemistry laboratory. Also, rinse the test tubes with tap, distilled or
deionized water for future usage.
Pre-Lab Questions:
(ON THE NEXT PAGE!)