answer all parts of teh question 2) Write out the mass balanced chemical equatio
ID: 52151 • Letter: A
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answer all parts of teh question
2) Write out the mass balanced chemical equation for photosynthesis, including all reactants and products and their chemical formulas (e.g., CO2, H2O). Explain how dissolved carbon dioxide affects pH of water using the chemical products formed from the reaction of CO2 in H2O. How does photosynthesis affect pH in aquatic ecosystems by changing dissolved carbon dioxide concentrations? Explain how the pH of water is related to the concentrations of dissolved carbon dioxide, bicarbonate, and carbonate. Where within a stratified lake (e.g., summer, northern latitude) would you expect pH to be highest and lowest? Explain why.Explanation / Answer
Answer 2.) Balanced equation for photosynthesis:
6CO2(g) + 6H2O(l) => C6H12O6 (s) + 6O2(g)
carbon dioxide+water => glucose + oxygen
How dissolved carbon dioxide affects pHof water:
CO2 + H2O ==> H2CO3 (carbon dioxide + water ==> carbonic acid)
H2CO3 rapidly dissociates . H2CO3 ==> H+ + HCO3-
These H+ ions decrease the ph of water to about 5.7
How does photosynthesis affect pH in aquatic ecosystem:
Photosynthesis removes carbon dioxide and adds oxygen to the aquatic ecosystems thereby increasing the pH of the water and reduces dissolved carbon dioxide concentration of water.
How pH of water is related to the concentration of dissolved carbon dioxide,bicarbonate and carbonate:
The carbon dioxide that is dissolved by naturally circulating waters appears in chemical analysis principally as bicarbonate and carbonate ions.When dissolved carbon dioxide concentration is high,then pH of water is low as dissolved carbon dioxide reacts with water to form carbonic acid which dissociates into H+ and HCO3- and When dissolved carbon dioxide concentration is low,then pH of water becomes high that is alkaline.When dissolved bicarbonate and carbonate concentration is high then pH of water becomes high.
Within a stratified lake where ph would be highest and lowest:
There is typically a seasonal decrease in pH in the lower layers of a stratified lake because CO2 accumulates. There is no light for plants to fix CO2 and decomposition releases CO2. Therefore pH is lowest in the lower layers and highest in the upper and surface layers.
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