The reason for using cabbage juice to calculate the rate of carbon dioxide production at rest and after exercise is because it acts as a pH indicator that changes color in acidic or basic solution. When you breathe out, you exhale carbon dioxide. This carbon dioxide can react with water to form carbonic acid, which is a weak acid. When this acid is present, it can lower the pH of a solution.

Cabbage juice contains a pigment molecule called flavin (an anthocyanin). This pigment changes color when it is mixed with different pH levels. Under neutral conditions, cabbage juice is purplish. In an acidic environment, it becomes reddish-pink, and in a basic (or alkaline) environment, it turns greenish-yellow.

So, when you exhale into the cabbage juice, the carbon dioxide you breathe out forms carbonic acid, lowering the pH of the solution and causing the cabbage juice to change color. By observing this color change, you can estimate the amount of carbon dioxide produced, and thus calculate the rate of carbon dioxide production.

Therefore, the correct answer is D. pH indicator that changes color in acidic or basic solution.

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The reason for using cabbage juice to calculate the rate of carbon dioxide production at rest and after exercise is because it acts as a pH indicator that changes color in acidic or basic solution. When you breathe out, you exhale carbon dioxide. This carbon dioxide can react with water to form carbonic acid, which is a weak acid. When this acid is present, it can lower the pH of a solution.

Cabbage juice contains a pigment molecule called flavin (an anthocyanin). This pigment changes color when it is mixed with different pH levels. Under neutral conditions, cabbage juice is purplish. In an acidic environment, it becomes reddish-pink, and in a basic (or alkaline) environment, it turns greenish-yellow.

So, when you exhale into the cabbage juice, the carbon dioxide you breathe out forms carbonic acid, lowering the pH of the solution and causing the cabbage juice to change color. By observing this color change, you can estimate the amount of carbon dioxide produced, and thus calculate the rate of carbon dioxide production.

Therefore, the correct answer is D. pH indicator that changes color in acidic or basic solution.

Knowee AI · Accepted Answer

The reason for using cabbage juice to calculate the rate of carbon dioxide production at rest and after exercise is because it acts as a pH indicator that changes color in acidic or basic solution. When you breathe out, you exhale carbon dioxide. This carbon dioxide can react with water to form carbonic acid, which is a weak acid. When this acid is present, it can lower the pH of a solution.

Cabbage juice contains a pigment molecule called flavin (an anthocyanin). This pigment changes color when it is mixed with different pH levels. Under neutral conditions, cabbage juice is purplish. In an acidic environment, it becomes reddish-pink, and in a basic (or alkaline) environment, it turns greenish-yellow.

So, when you exhale into the cabbage juice, the carbon dioxide you breathe out forms carbonic acid, lowering the pH of the solution and causing the cabbage juice to change color. By observing this color change, you can estimate the amount of carbon dioxide produced, and thus calculate the rate of carbon dioxide production.

Therefore, the correct answer is D. pH indicator that changes color in acidic or basic solution.

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