Solved: Carminic acid, a naturally occurring red pigment

Chapter , Problem 92

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Carminic acid, a naturally occurring red pigment extracted fromthe cochineal insect, contains only carbon, hydrogen, and oxygen.It was commonly used as a dye in the first half of the nineteenthcentury. It is 53.66% C and 4.09% H by mass. A titration required18.02 mL of 0.0406 MNaOH to neutralize 0.3602 g carminic acid.Assuming that there is only one acidic hydrogen per molecule,what is the molecular formula of carminic acid?

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