Why should one subtract the optical rotation value of a blank from that of the s

Question

Why should one subtract the optical rotation value of a blank from that of the solution when calculating optical rotation if the blank itself is not chiral? A. All solvents are chiral, therefore subtracting its effects is not necessary. B. The solvent, even if it is not chiral, can affect the flow of light through the solution and this effect must be subtracted from the observed value. C. Subtracting the optical rotation value of the blank from that of the solution eliminates any differential temperature effects. D. None of the answers shown are correct. E. This procedure is necessary to remove the effects of chemical reactions taking place between the compound of interest and the solvent.

Explanation / Answer

B. The solvent, even if it is not chiral, can affect the flow of light through the solution and this effect must be subtracted from the observed value.

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