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What is the observed rotation when 0.1 M...

What is the observed rotation when `0.1 M` solutions of `(R )-2` butanol is mixed with an equal volume of `0.05M` solution of recemic `2-butnol` and the resulting solution is taken in a cell of `5cm` long tube in a polarimeter? The specific rotation of `(R -2)` butonal is `+13.9^(@)`

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