What colour would hydrogencarbonate indicator turn when added to pondweed in bright light?YellowRedPurple¿Feedback?

To determine the color change of the hydrogencarbonate indicator when added to pondweed in bright light, we need to consider the process of photosynthesis and the role of carbon dioxide in this reaction.

1. Understanding Photosynthesis: In bright light, pondweed (or aquatic plants) carry out photosynthesis, which utilizes carbon dioxide (CO₂) and releases oxygen (O₂).

2. Hydrogencarbonate Indicator Function: The hydrogencarbonate indicator is used to measure the concentration of carbon dioxide in a solution. In acidic conditions (more CO₂), the indicator turns yellow; in neutral conditions, it appears orange; and in basic conditions (less CO₂ due to plant activity), it turns purple.

3. In Bright Light Scenarios: When pondweed is exposed to bright light, it absorbs CO₂ for photosynthesis, thus reducing its concentration in the surrounding water. As a result, the water's pH becomes more alkaline (basic).

Based on these points, the answer is:

Final Answer

Purple; when added to pondweed in bright light, the hydrogencarbonate indicator would turn purple due to decreased CO₂ levels.