What is the observed rotation for a solution

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The specific rotation, [?]D, for (+)-tartaric acid is +12. What is the observed rotation for a solution of 0.75 g of (+)-tartaric acid in 10 mL of water in a sample tube having a pathlength of 10 cm?

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What is the observed rotation for a solution : The specific rotation, [?]D, for (+)-tartaric acid is +12. What is the observed rotation for a solution of 0.75 g of (+)-tartaric acid in 10 mL of water in a sample tube having a pathlength of 10 cm?

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