(+) Tartaric acid has a specific rotation of +15°. The specific rotation of a mixture of 70% (+) Tartaric acid & 30% (

Engineering

Chemistry

Optical Isomerism

Empirical and Molecular Formula

Question

(+) Tartaric acid has a specific rotation of +15°. The specific rotation of a mixture of 70% (+) Tartaric acid & 30% (–) Tartaric acid is

10.5°

4.5°

7.5 °

6°

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$Optical purity = \frac{Q_{m}}{Q_{p}} \times 100 or \frac{| d - ℓ |}{d + ℓ} \times 100$
$O . P . = \frac{| 0 .70 - 0.30 |}{1} \times 100 = 40 %$
$\frac{Q_{m}}{15 °} \times 100 = 40$
Q_m = 6°