Under Pressure Kit

Under Pressure Kit

Under Pressure Kit

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The color change phenomenon observed in this demonstration models Le Châtelier’s principle as it relates to pressure changes in gas reactions. Students observe an equilibrium shift for carbonated water from the product side to the reactant side, producing a new equilibrium with less acidity than the original solution. Evidence for this is shown by an acid indicator changing color and carbon dioxide gas bubbling out of the solution.

Time Requirement
Total, 20 minutes. Teacher prep, 10 minutes. Demonstration and discussion, 10 minutes.

Digital Resources
Includes 1-year access to digital resources that support 3-dimensional instruction for NGSS. Digital resources may include a teacher manual and student guide, pre-lab activities and setup videos, phenomenon videos, simulations, and post-lab analysis and assessments.

Performance Expectations

Crosscutting Concepts
Stability and Change

Disciplinary Core Ideas
PS1.B: Chemical Reactions

Science and Engineering Practices
Developing and Using Models

Learning Objectives

  • Predict in which direction the equilibrium will shift in a system to which pressure is applied.
  • Create and label a drawing that explains how the reaction occurs on a particulate level.
  • Learn that reversible chemical reactions are dynamic processes dependent on ambient conditions.

Prerequisite Knowledge and Skills
Students should be familiar with reversible chemical reactions and have an understanding that all reversible reactions reach a state of dynamic equilibrium after a given time. Students should also understand that there is no overall net change in reactants or products since the forward and reverse reaction rates are constant.

Name Include Note
White Paper, 8-1/2 x 11” Needed, Not Included
Paper Towels Needed, Not Included
Pliers Needed, Not Included
Syringe, 60 cc Included
Luer Lock (for syringe) Included
Methyl Red, 0.20%, 15 mL Included
Teacher’s Manual with Reproducible Student Sheet Included
Graduated Cylinder, 100 mL Needed, Not Included
Beaker, 100 mL Needed, Not Included
Test Tubes, Standard Needed, Not Included
Seltzer Water, 1 L Needed, Not Included
Carolina Science Online® Resources (1-year subscription) Included



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All shortages, defects and deficiencies must be reported within 7 days of receiving the shipment. Merlan Scientific cannot assume responsibility for shortages reported after this period.

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Merlan Scientific warrants that each product will be free of defects in materials and workmanship for a period set forth in its published user manuals for its system products and for a period of one (1) year for its component products. The warranty commences on the date the product is shipped by Merlan Scientific. Merlan Scientifics’ sole liability and responsibility under this warranty is to repair or replace any defective product, which is returned to it by the buyer, and which Merlan Scientific determines qualifies for repair or replacement under the terms of the applicable warranty. The product returned to Merlan Scientific for warranty service will be shipped to Merlan Scientific at the buyers expense and will be returned to buyer at Merlan Scientifics’ expense. In no event shall Merlan Scientific be responsible under its warranty for any defect, which is caused by negligence, misuse or mistreatment of a product, or for any unit, which has been altered or modified in any way. The warranty of repaired and replacement products shall terminate with the original warranty of the product.

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