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What is the observed rotation when 0.1 M solution of (R)–2 butanol is mixed with an equal volume of 0.05M

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What is the observed rotation when 0.1 M solution of (R)–2 butanol is mixed with an equal volume of 0.05M solution of racemic 2– butanol and the resulting solution is taken in a cell of 5 cm long tube in a polarimeter? The specific rotation of (R)–2–butanol is +13.9°

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The racemic 2–butanol has no contribution to optical activity . So, the observed rotation will be due to (R)–2 butanol only. Racemic butanol helps in diluting after dilution is 0.05M. Molecular weight of 2– butanol is 74.

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