air quality: carbon dioxide deborah carlisle and steve schneider
TRANSCRIPT
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Air Quality: Carbon Dioxide
Deborah Carlisleand
Steve Schneider
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The Big Idea: Measuring Relative Amounts of CO2
Bromothymol Blue (BTB) changes color when CO2 is added.
BLUE TO YELLOW
YELLOW indicates an increase in the amount of CO2 gas.
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When CO2 is added the solution becomes acidic.
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What are we observing when BTB changes color?
In solution BTB can be in a “protonated” form or an “deprotonated” form. It is protonated in acidic solution.
H2CO3 H+ + HCO3- H+ +
CO32-
Yellow Blue
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Where does CO2 come from?What will our students say?
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Breath contains Carbon DioxideMolecules
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Compare Controls
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Making BTBEach Group make upRefer to Handout and Use Tap Water
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Control 50mL of CO2
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10 mL CO2 50 mL CO2
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Calibration Scale
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The ExperimentQuestion: Can we prove breath is about 5%
CO2?
Join your assigned group of 4 Create a calibration scale for BREATHPhotographImport photo and sample the colors in your
calibration scale using the line toolMake a graph of color intensity vs. percent
CO2
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Calibration Scale % CO2
Control 1.25 % 1.75% 2.5% 50 mL breath w/exercise
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Graph Data from image sampled with rectangle tool
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GraphUse graph Excel or graph paper to make a
graph of your results
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Results