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BW- Paper Lab

Explore photosynthesis with Elodea plant and bromothymol blue to observe CO2 consumption. Learn how the indicator changes color in presence of CO2. Day 1 setup with 2 tubes under different light conditions, followed by analysis on Day 2. Answer key questions related to photosynthetic reactions.

ayanna-wilson
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BW- Paper Lab

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  1. BW- Paper Lab • BACKGROUND: In water, carbon dioxide dissolves to form a weak acid. • As a result, an acid-based indicator such as bromothymolblue 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 bromothymolblue to investigate whether photosynthesis is occurring & then explain how we know.

  2. DAY 1 with Elodea plant in Bromothymol blue solution & CO2- 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. DAY 2: tube under light: in dark: • BW Questions: • What is the IDV? • What is the DV? • In what photosynthetic reaction is CO2 used? • What is needed for CO2 to be used • How are these reactants (from Q#4) produced? • What specifically caused the tube to change from yellow-green to blue?

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