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If you used a reaction tube that is not completely dry in this Grignard Reaction experiment,...

If you used a reaction tube that is not completely dry in this Grignard Reaction experiment, what organic byproduct would you expect?  How much water (in µL) would it take to react completely with the desired product?  Show your calculation.  (Presume that one H2O is needed for each RMgX.)

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