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(+) mandelic acid has a specific rotation of 158°. What would be the observed specific rotation of a mixture of 25percent (-) mandelic acid and 75percent (+) mandelic acid?

(+) mandelic acid has a specific rotation of 158°. What would be the observed specific rotation of a mixture of 25percent (-) mandelic acid and 75percent (+) mandelic acid?

Grade:11

1 Answers

Anjana kamal
24 Points
6 years ago
Positive mandelic acid has a specific rotation of +158° so negative mandelic acid will have -158°.The observed specific rotation will be:[75/100]× (-158) + [ 25/100]× (-158)= +79°

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