Dissolved Oxygen Lab

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The Effect of Type of Water on Dissolved Oxygen Research Question: How does the type of water affect affect the amount of oxygen dissolved in plant water? Purpose: The purpose of this lab is to determine which type of water (distilled, with snail, plant, with snail and plant) produced the most dissolved oxygen and which produced the least. Hypothesis: If there is a snail in the plant water, then there would be more dissolved oxygen than in distilled water because snails release carbon dioxide that can be used for photosynthesis from the plants. Materials: Test tube (1) Beaker (1) Snail (1) Distilled Water (approx. 80 mL) Plant Water (approx. 80 mL) Plastic Cup (1) Dissolved Oxygen Interface/Meter and Probe (1) Procedure: Calibrate and set up dissolved oxygen monitor with probe. Pour around 80 mL of distilled water into the beaker. Transfer it into the test tube.…show more content…
It is possible that the water received from the top of the pond water bowl had little organisms, compared to the bottom. Without any photosynthetic autotrophs, no oxygen was being release and no carbon dioxide was being absorbed. Photosynthesis is the conversion of light energy to chemical energy that is stored in glucose or other organic compounds. It only occurs in plants, algae, and certain prokaryotes. The snail wasn't adding any oxygen to the plant water. It was absorbing oxygen away from the water, as part of its respiratory system. Respiration is the transport of oxygen from outside to cells within and the transport carbon dioxide in the opposite direction. Therefore, while the snail absorbed the oxygen from the water, which decreased the potential amount of oxygen dissolved, it also added carbon dioxide. Since there were no or little autotrophs to convert that oxygen, it remained and piled up as the snail kept

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