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Balloon Stoichiometry Kit

Item # 840366 Exclusive This product is exclusive to Carolina Biological Supply. With Digital This kit includes 1-year access to digital resources including videos, digital teacher’s manuals, printable student guides, interactive lessons, editable assessment questions, and more.

Product Highlights

  • Observe balloons fill with carbon dioxide gas from the reaction of sodium bicarbonate and hydrochloric acid.
  • High school teacher-led, student-engaged demonstration with enough materials for 4 performances.
  • Carolina Kits 3D®—Labs that use phenomena to support NGSS and 3-dimensional instruction.



In stock and available to ship.

In this demonstration, students experience the phenomenon of stoichiometry as they learn that chemical reactants combine in fixed molar ratios according to the coefficients of a balanced equation. Students observe 3 balloons attached to 3 flasks fill with carbon dioxide gas from the reaction of sodium bicarbonate and hydrochloric acid. Each flask has a different proportion of acid to base, resulting in different yields of carbon dioxide gas and unequally filled balloons. A pH indicator provides a qualitative measure of pH for the products in the solutions. Students demonstrate their learning by writing a balanced equation for the reaction in each flask and identifying the limiting and excess reactants from the molar ratios used.

Time Requirement
Total, 30 minutes. Teacher prep, 15 minutes. Demonstration and discussion, 15 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
Energy and Matter
Connections to Nature of Science: Scientific Knowledge Assumes an Order and Consistency in Natural Systems

Disciplinary Core Ideas
PS1.B: Chemical Reactions

Science and Engineering Practices
Using Mathematics and Computational Thinking

Learning Objectives

  • Predict what will happen during each reaction on the basis of prior knowledge.
  • Learn how a limiting reactant affects the amount of product in a chemical reaction.
  • Illustrate and explain at a molecular level how stoichiometric reactions occur.

Prerequisite Knowledge and Skills
Students should be familiar with atomic, molecular, and formula masses; writing and interpreting a balanced chemical equation; calculating moles from grams and from a given volume of molar concentration; and the pH scale.

  • WARNING: CHOKING HAZARD - Children under 8 yrs. can choke or suffocate on uninflated or broken balloons. Adult supervision required. Keep uninflated balloons from children. Discard broken balloons at once.
  • This item is only available from Carolina Biological Supply Company.
  • Limited Qty: Corrosive - This product is/contains a limited quantity of a DOT regulated hazardous material. This item will not incur a hazmat fee when shipped by ground. Orders shipping to HI and AK are subject to review and may incur additional shipping charges.

Product Families Featuring This Item:

Components Qty Included?
Bromphenol Blue, 1%, 30 mL 1 Included
1 M Hydrochloric Acid, 500 mL 1 Included
Sodium Bicarbonate, 227 g 1 Included
Balloons 20 Included
Funnel 1 Included
Plastic Scoop 1 Included
Craft Stick 1 Included
Carolina Science Online® Resources (1-year subscription) 1 Included
Teacher's Manual with Reproducible Student Guide 1 Included
Beaker, 100 or 250 mL 1 Needed, Not Included
Erlenmeyer Flasks, 250 mL 3 Needed, Not Included
Graduated Cylinders, 50 mL 3 Needed, Not Included
Graduated Cylinders, 100 mL 3 Needed, Not Included
Marker Needed, Not Included
Labeling Tape Needed, Not Included
Distilled Water Needed, Not Included