Presentation on theme: "BW- Paper Lab Without carbon dioxide: indicator is blue;"— Presentation transcript:
1 BW- Paper Lab Without carbon dioxide: indicator is blue; 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 2: tube under light: in dark: DAY 1 with Elodea plant in Bromothymol blue solution & CO2- there are 2 tubes that look like thisPut 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 usedHow are these reactants (from Q#4) produced?What specifically caused the tube to change from yellow-green to blue?
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