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BW- Paper Lab BACKGROUND: In water, carbon dioxide dissolves to form a weak acid. As a result, an acid-based indicator such as bromothymol blue can be.

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Presentation on theme: "BW- Paper Lab BACKGROUND: In water, carbon dioxide dissolves to form a weak acid. As a result, an acid-based indicator such as bromothymol blue can be."— Presentation transcript:

1 BW- Paper Lab BACKGROUND: In water, carbon dioxide dissolves to form a weak acid. As a result, an acid-based indicator such as bromothymol blue can be used to indicate the presence of carbon dioxide. Without carbon dioxide: indicator is blue; With carbon dioxide: indicator is yellow-green. In this investigation, we will use bromothymol blue to investigate whether photosynthesis is occurring & then explain how we know.

2 DAY 1 with Elodea plant in Bromothymol blue solution & CO 2 - there are 2 tubes that look like this – Put 1 tube on a light cart & put 1 tube in a drawer (dark) DAY 2: tube under light: in dark:

3 BW Questions: 1.What is the IDV? 2.What is the DV? 3.In what photosynthetic reaction is CO 2 used? 4.What is needed for CO 2 to be used 5.How are these reactants (from Q#4) produced? 6.What specifically caused the tube to change from yellow-green to blue?


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