Determination of indicator in acid form
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?
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