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5. The measured rotation of pure L(+)-ascorbic acid is +2.3(10% w/v aqueous solution in a 10mm cell). ( 12%) (1) Estimate []20D of L(+)-ascorbic acid.

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5. The measured rotation of pure L(+)-ascorbic acid is +2.3(10% w/v aqueous solution in a 10mm cell). ( 12%) (1) Estimate []20D of L(+)-ascorbic acid. (2) Determine the composition percentages in a mixture of (+) Vitamin C with a rotation of +2.0. (3) It is misleading to get called C (actually its optically positive). Please correct its Chinese name and explain the reason. 8. Which reaction in each of following pairs will take place more ranidly? Explain the reasons. ( 10%)

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