Chemistry 1 Project 4

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Name
_________________________________
I.D. Number
_______________________
Project 4
Evaluation 34
Chemistry 1 (SCIH 031 062)
Be sure to include ALL pages of this project (including the directions and the assignment) when you
send the project to your teacher for grading. Donâ??t forget to put your name and I.D. number at the top
of this page!
This project will count for 10% and is worth 100 points of your overall grade for this course. Be sure
to read all the instructions and assemble all the necessary materials before you begin. You will
need to print this document and complete it on paper. Feel free to attach extra pages if you
need them.
When you have completed this project you may submit it electronically through the online course
management system by scanning the pages into either .pdf (Portable Document Format), or .doc
(Microsoft Word document) format. If you scan your project as images, embed them in a Word
document in .gif image format. Using .gif images that are smaller than 8 x 10 inches, or 600 x 800
pixels, will help ensure that the project is small enough to upload. Remember that a file that is larger
than 5,000 K will NOT go through the online system. Make sure your pages are legible before you
upload them.** Check the instructions in the online course for more information.
Project 4- Balancing Equations
Purpose: Writing a balanced chemical equation is at the core of many important chemical concepts.
The equation is a descriptive narrative, or story, about a specific event. The story is told from the
viewpoint of atoms, ions, and molecules. The narrative, however, includes more than just a
description. It also includes quantitative information about moles. The coefficients in front of each
component in a balanced equation can be taken as representations of the moles of each reactant
and product. The ratio of moles between each component allows for predictions of â??how much is
neededâ? and â??how much can be formed.â? In that sense, the mole ratio is similar to the specifics in a
cooking recipe.
If two components are shown to be reacting with a balanced equation, the mole ratio between the
two components dictates the quantity that must be present in order for the components to have the
opportunity to fully react. If one of the components in an experiment is below the amount needed to
fully react with the other component, then the deficient one is called the limiting reactant.
The reaction between baking soda (NaHCO3) and vinegar (dilute acetic acid: CH3COOH) produces
CO2 and H2O. In this project, you will perform several experiments with different amounts of
reactants to determine which amounts present a limiting reactant situation.
Safety Awareness: The ingredients you will use in this project are common household substances
and, as such, are relatively safe to handle (do not ingest any of the substances). The small amounts
of reactants in the reaction produces CO2 gas with some degree of pressure so do not exceed these
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amounts, and do not allow the pressure to build beyond the limits of the container. Dispose of the
balloons and contents in an appropriate trash container.
Laboratory Materials List
The Projects in this course require special materials. All of the materials for this lab will need to be
provided by you, the student. Before doing a project, gather all the items you will need for that
specific project and out them on a clear workspace.
Student Will Supply
four rubber balloons (spherical shape)
baking soda (NaHCO3)
white vinegar (Dilute acetic acid; CH3COOH)
pencil
set of measuring spoons
funnel
Part A â?? Procedure
1. Give each balloon a quick stretch and number the four balloons from 1 to 4.
2. Make a funnel from any type of paper. If you are unsure how to make a paper funnel, here is
a link: http://www.wikihow.com/Make-a-Funnel-or-Cone-from-Paper
3. Into balloon number one, place one-fourth of a level teaspoon of baking soda. Place one-half
of a level teaspoon of baking soda in balloon number 2. Place three-fourths of a level
teaspoon of baking soda in balloon number 3, and one level teaspoon of baking soda in
balloon number 4.
4. Measure 2 tablespoons of white vinegar and quickly pour it through the funnel into one of the
balloons. Very quickly remove the funnel and tie off the balloon opening. Set this balloon
aside.
5. Repeat procedure Step 3 with the rest of the balloons.
6. Compare the sizes of each balloon and rank them from smallest to largest volume. (Note: if
the balloons are fairly spherical, you may measure their circumferences and convert those
amounts to volume, or just estimate their volume from what you see.)
CALCULATIONS: Record data on chart below
Moles NaHCO3: One teaspoon of baking soda will have an approximate mass of 3.2 grams. From
the molar mass of NaHCO3, determine and report the number of moles you have added to each
balloon.
Moles of CH3COOH: The volume of 1 tablespoon is 15 mL. Therefore, 2 tablespoons of vinegar has
a volume of 30 mL. White vinegar is approximately 5 percent CH3COOH. This means that you have
added (0.05 x 30) 1.5 grams of acetic acid to each balloon. From the molar mass of CH3COOH,
determine the number of moles of acetic acid you added to each balloon.
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Part B- Data Organization (possible 40 points)
In column two, write in the mass and calculated moles of NaHCO3 for each of the four balloons. In
column three, write in the mass and calculated moles of CH3COOH you placed in each balloon. In
column four, rank the volume of CO2 gathered in each balloon. Data for each experiment will be
worth 10 points each. Be sure to show all calculations and units of measurements in your
responses.
Experiment
Number
Moles of
NaHCO3
Moles of
CH3COOH
Rank of
CO2 produced
1
2
3
4
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Part C â?? Analyze (possible 60 points)
Write out the complete balanced equation for the reaction in the balloons.
Balanced equation: _______________________________________________________________
Now you will be ready to draw some conclusions about your experiment. Be sure to show all
calculations and units of measurements in your responses. Each question is worth twelve points.
Question 1: Which combination of ingredients (balloon 1, 2, 3, or 4) produced the greatest amount
of product (CO2)?
Question 2: Which balloon(s) had NaHCO3 as the limiting reactant? Which balloon(s) had
CH3COOH as the limiting reactant?
Question 3: Why is the amount of grams of each reactant not the proper way to determine the
limiting reactant? Does any balloon illustrate this point?
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Question 4: Why is comparing moles of reactants without using the balanced equation not the
proper way to determine the limiting reactant?
Question 5: Why did one reaction situation produce the greatest volume of CO2?
This project can be submitted electronically. Check the Project page under â??My Workâ? in the
UNHS online course management system or your enrollment information with your print
materials for more detailed instructions.
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Project 4
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