A hydrogencarbonate indicator (hydrogencarbonate indicator) is a type of pH indicator that is sensitive enough to show a color change as the concentration of carbon dioxide gas in an aqueous solution increases. The indicator is used in photosynthesis and respiration experiments to find out whether carbon dioxide is being liberated. It is also used to test the carbon dioxide content during gaseous exchange of organisms. When the carbon dioxide content is higher than 0.04%, the initial red colour changes to yellow as the pH becomes more acidic. If the carbon dioxide content is lower than 0.04%, it changes from red to magenta and, in relatively very low carbon dioxide concentrations, to purple. Carbon dioxide, even in the concentrations found in exhaled air, will dissolve in the indicator to
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| - Bicarbonate indicator (en)
- 碳酸氢盐指示剂 (zh)
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| - 碳酸氢盐指示剂（英語：Hydrogencarbonate indicator/Bicarbonate indicator）是一种容易吸收二氧化碳的化学物质，用于在光合作用及呼吸实验时检测二氧化碳是否被释放。当碳酸氢盐指示剂呈紫色时，二氧化碳濃度处于少於0.03%的状态；當指示劑呈紅色時，二氧化碳濃度約等於0.03%（即大氣中二氧化碳的含量）；当碳酸氢盐指示剂呈黄色时，证明濃度高於0.03%的二氧化碳被测出来。 (zh)
- A hydrogencarbonate indicator (hydrogencarbonate indicator) is a type of pH indicator that is sensitive enough to show a color change as the concentration of carbon dioxide gas in an aqueous solution increases. The indicator is used in photosynthesis and respiration experiments to find out whether carbon dioxide is being liberated. It is also used to test the carbon dioxide content during gaseous exchange of organisms. When the carbon dioxide content is higher than 0.04%, the initial red colour changes to yellow as the pH becomes more acidic. If the carbon dioxide content is lower than 0.04%, it changes from red to magenta and, in relatively very low carbon dioxide concentrations, to purple. Carbon dioxide, even in the concentrations found in exhaled air, will dissolve in the indicator to (en)
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| - A hydrogencarbonate indicator (hydrogencarbonate indicator) is a type of pH indicator that is sensitive enough to show a color change as the concentration of carbon dioxide gas in an aqueous solution increases. The indicator is used in photosynthesis and respiration experiments to find out whether carbon dioxide is being liberated. It is also used to test the carbon dioxide content during gaseous exchange of organisms. When the carbon dioxide content is higher than 0.04%, the initial red colour changes to yellow as the pH becomes more acidic. If the carbon dioxide content is lower than 0.04%, it changes from red to magenta and, in relatively very low carbon dioxide concentrations, to purple. Carbon dioxide, even in the concentrations found in exhaled air, will dissolve in the indicator to form carbonic acid, a weak acid, which will lower the pH and give the characteristic colour change. A colour change to purple during photosynthesis shows a reduction in the percentage of carbon dioxide and is sometimes inferred as production of oxygen, but there is not actually any direct evidence for it. Great care must be taken to avoid acidic or alkaline contamination of the apparatus in such experiments, since the test is not directly specific to gases like carbon dioxide. (en)
- 碳酸氢盐指示剂（英語：Hydrogencarbonate indicator/Bicarbonate indicator）是一种容易吸收二氧化碳的化学物质，用于在光合作用及呼吸实验时检测二氧化碳是否被释放。当碳酸氢盐指示剂呈紫色时，二氧化碳濃度处于少於0.03%的状态；當指示劑呈紅色時，二氧化碳濃度約等於0.03%（即大氣中二氧化碳的含量）；当碳酸氢盐指示剂呈黄色时，证明濃度高於0.03%的二氧化碳被测出来。 (zh)
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