Hypothesis: The pH of the water containing Elodea will be higher (more alkaline) when exposed to light compared to when kept in the dark.
Explanation:
* Photosynthesis: Elodea, like most aquatic plants, performs photosynthesis. This process uses carbon dioxide (CO2) and water (H2O) in the presence of sunlight to produce glucose (sugar) and oxygen (O2).
* CO2 Consumption: During photosynthesis, Elodea consumes CO2 from the water. Carbon dioxide is acidic.
* pH Change: As CO2 is removed from the water, the pH of the water will increase, becoming more alkaline (less acidic).
Prediction:
* Light: The water containing Elodea exposed to light will have a higher pH (more alkaline) due to the consumption of CO2 during photosynthesis.
* Dark: The water containing Elodea kept in the dark will have a lower pH (more acidic) because photosynthesis is not occurring, and CO2 is not being consumed.
Note:
* You would need to use a pH indicator to observe the color change in the water.
* This experiment is a good way to demonstrate the effect of photosynthesis on the pH of water.
