My PBL Project- Balloon race
1. Introduction: By observing the amounts of gas generated, I will be able to identify the limiting and excess reactant in each situation.
2.Safety Precautions: Gloves, safety goggles, and an apron.
3. Materials: Weighing dish, 6
Graduated cylinder, 25 mL or 50 mL
Erlenmeyer flask, 125 mL, 6
Funnel Powder
Balloons, 6
Spatula
Permanent marker
Sodium bicarbonate, 10.5 g
Acetic acid, 1M, 150 mL
4. Procedure
1. Label six Erlenmeyer flasks from 1 to 6. Using the graduated cylinder, measure 25 mL acetic acid and to each flask.
2. Label six weighing dishes from 1 to 6. Mass 0.50g, 1.00g 1.50 g, 2.00g, 2.50g, and 3.00g of sodium bicarbonate in each of the labeled weighing dishes.
3. Obtain six balloons and stretch them to allow for easy expansion. Using the funnel, add the sodium bicarbonate from the weighing dishes to each of the balloons.
4. Holding the balloon to one side carefully to avoid dropping the sodium bicarbonate into the acetic acid stretch the opening of the balloon over the mouth of the flask. Repeat the process so that each balloon with the baking soda is placed firmly over each labeled flask.
5. Line up the Erlenmeyer setup from 1 to 6. With the team members working together, raise the balloons.to allow the powder to fall into the acid in the flask at the same time. (Make sure the balloon is firmly fixed to the flask.)
4. Scientific principle: Stoichiometric relationships: The calculation of relative quantities of reactants and products in chemical reactions. Stoichiometry is founded on the law of conservation of mass where the total mass of the reactants equals the total mass of the products.
Scientific Principle or/ and concepts- Stoichiometric relationships: Chemistry that deals with the relative quantities of reactants and products in chemical reactions.
Stoichiometry quantitatively describes relationships between substances in a reaction. It is used for balancing chemical equations. The ratio between reactants is an integer ratio. A stoichiometric number countsmolecules that are consumed (negative) and produced (positive) in a reaction.
Stoichiometry is based on the law of mass conservation, where amounts of reagent and product are equal. The ideal amount of reagent—the stoichiometric amount—is completely consumed during a reaction. In non-stoichiometric reactions, only the limiting reagent will be completely consumed.
The stoichiometric coefficient of chemicals that do not participate in a reaction and that of a catalyst is zero. Because reactions occur between whole molecules, the stoichiometric ratio is always an integer ratio.
Chemical equations: A chemical equation is the symbolic representation of a chemical reaction
Stoichiometric quantities: The quantitative relationship between reactants and products in a chemical reaction.
5. Safety Precautions: Acetic acid is a skin and eye irritant. Avoid contact with skin and eyes. Wear chemical splash goggles, chemical-resistant gloves, and a chemical-resistant apron. Review the Material Safety Data Sheets of the chemicals used for additional safety, handling and disposal information
