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Answer to Question #88559 in General Chemistry for Lim Yoona
Question #88559
An indicator can exist in two forms, depending on pH. One form is green, the other blue.
At pH 1, the indicator is entirely in the acid form (green). The absorbance of a 0.01 mol L-1 solution at 650 nm is 0.451.
At pH 10, the indicator is entirely in the base form (blue). The absorbance of a 0.01 mol L-1 solution at 650 nm is 0.131.
At pH 7, the absorbance of a 0.01 mol L-1 solution is 0.362. What percentage of the indicator is in the acid (green) form?
At pH 1, the indicator is entirely in the acid form (green). The absorbance of a 0.01 mol L-1 solution at 650 nm is 0.451.
At pH 10, the indicator is entirely in the base form (blue). The absorbance of a 0.01 mol L-1 solution at 650 nm is 0.131.
At pH 7, the absorbance of a 0.01 mol L-1 solution is 0.362. What percentage of the indicator is in the acid (green) form?
Expert's answer
0.245856354%
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That answer is incorrect
Dear Lim Yoona, Questions in this section are answered for free. We can't fulfill them all and there is no guarantee of answering certain question but we are doing our best. And if answer is published it means it was attentively checked by experts. You can try it yourself by publishing your question. Although if you have serious assignment that requires large amount of work and hence cannot be done for free you can submit it as assignment and our experts will surely assist you. a
Students took 2.5 ml of a leaf extract and using column chromatography they separated carotene from chlorophyll. The students collected carotene in a volumetric flask and made up their sample to the 25 mL line on the volumetric flask with hexane:acetone (3:2). The student measured the absorbance of the purified carotene (collected in the volumetric flask), and found that it corresponded to a concentration of 0.031 mg mL-1. What was the concentration carotene in the original leaf extract in mg mL-1 ?
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