Equilibrium with Solubility gas constant

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VIDEO LINKS:

Lab Experiments (Write protocols and perform experiments based on these):

  1. Gas Solubility Constant
  2. Making Red Cabbage Indicator Solution
   

Demonstration (Optional):

  1. Equilibrium simulation
  2. Study of Le Chatelier’s principle with cobalt compounds
  3. Study of Le Chatelier’s principle with NO2
  4. pH demo
 

The prelab must include Experimental Protocol, Chemical Table and Equipment Table.

The lab report requires all sections (including prelab sections) to be completed in one document.

 

Experimental Protocol

(Analysis) Watch the experiment videos.  Take notes on the protocol.  Stop the video and re-watch as necessary to acquire the details of the procedure.  Write out the protocol for each part of the experiment.  (It can be written in sequential steps.  Complete sentences are not necessary.)  This is the protocol you will follow, so be detailed.

Chemical Table

(Representation) Prepare your chemical table including the materials you will use in the experiment.  Here is a general template that you may use.
Chemical Name Chemical Formula Molar Mass (g/mol) Hazards Reference PPE
Sodium Chloride NaCl 58.5 Skin irritation https://fscimage.fishersci.com/msds/21105.htm  
         
         
         

Equipment Table

(Analysis) Identify the equipment (type AND size) needed for the experiment and include the name and an image of each.  Be sure to describe the equipment, how to use it, and why it is suitable for this use.
Equipment Name Equipment Picture Intended Purpose

Data Collection

(Acquiring competencies) Following your detailed protocol based on the videos, perform all the experiments. Record your observations and take pictures of your key steps in the process.  Your observations and images need to be incorporated in your data section and this section should be as detailed as possible as you will use this information to complete your discussion.

Data Processing

  1. (Representation) Write the chemical equation for the reaction of carbon dioxide with water to produce carbonic acid.
  2. (Representation) Write the ionization reaction of carbonic acid.
  3. (Interpretation) Show the influence of temperature on the equilibrium in the above reaction.
  4. (Interpretation) Show the influence of pH on the equilibrium in the above reactions.
  5. (Manipulation) Calculate the solubility of CO2 in a closed can of Seltzer water. (Hint: the pressure of CO2 in the can is 4 atm)
  6. (Manipulation) Calculate the solubility of CO2 in an open can of Seltzer water. (Hint: the pressure of CO2 in air is 0.0004 atm)
  7. (Assumptions and Analysis) Fill in the following table using the observations and data from your experiments.
Assumptions made Testing the assumption If assumptions are wrong ...
The balloon is filled with carbon dioxide.

Discussion

Write a minimum one-page (12 font, single spaced) discussion on the experiment conducted this week. Address at least one question in each category as fully as possible integrating the collected data, providing explanations for the observed trends and evaluating whether your original assumptions about the experiment were validated by the results. The assignment will be graded on completeness, clarity of the explanations and the meaningful integration of the collected and calculated data. Correct grammar and appropriate format for the chemical formulae and chemical reactions is expected. You may use the outline included at the end of this document on how to build your essay to address each category.
  1. (Existing knowledge, research, and views) Explain equilibrium and Le Chatelier’s Principle.
  2. (Existing knowledge, research, and views) Describe how the addition of an acid or a base impact the solubility of carbon dioxide in water.
  3. (Analysis) Describe what happens to an equilibrium constant as a result of a change in temperature. You may also refer to at least one example from the experiment for your argument.
  4. (Analysis) Describe what happens when extra reactants are added to a reaction. Identify at least one relevant example from your experiment.
  5. (Assumptions) Predict what would happen when products build up in a reaction and provide at least one supported argument for your choice.
  6. (Assumptions) Predict what would happen in the experiment if the carbon dioxide pressure was increased and provide at least one supported argument for your prediction.
  7. (Existing knowledge, research, and views) Identify the units for an equilibrium constant and provide a reasonable justification for your answer.
  8. (Analysis) Experiments are typically carried out with a control. Identify the control sample in your experiment and provide at least one supported argument for the necessity of using a control.
  9. (Experiment design) Propose another experiment that illustrates a chemical equilibrium using a liquid and a gas. Identify the variables that your proposed experiment studies and describe the expected outcome.
  10. (Experiment design) Propose another experiment that illustrates a chemical equilibrium using something other than a gas. Identify the variables that your proposed experiment studies and describe the expected outcome.
  11. (Analysis) Global warming leads to an increase in the average temperature of the planet and it is caused by greenhouse gas emissions (including carbon dioxide). Predict how the combination of higher temperature and higher carbon dioxide influences the oceans.
  12. (Analysis) Coral reefs, like eggshells are composed mainly of calcium carbonate. Their destruction is often linked to the carbon dioxide emissions. Provide a reasonable and supported argument for how that is possible using the solubilities of calcium carbonate and carbon dioxide in water.