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

Question

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

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Solution

Hydrogencarbonate indicator is used to measure the levels of carbon dioxide in solutions. When photosynthesis occurs in pondweed, the plant uses up carbon dioxide. This decrease in carbon dioxide will cause the hydrogencarbonate indicator to change color.

In bright light, photosynthesis will occur at a higher rate, meaning more carbon dioxide is used up. This will cause the hydrogencarbonate indicator to turn purple, indicating a low level of carbon dioxide.

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