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chemical reaction of NaOH in the air

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I'm wondering if you could help me answer a few questions about a lab I'm doing. We are preparing an a,b-unsaturated ketone via Michael and aldol condensation reactions. The reactants are trans-chalcone and ethyl acetoacetate (in ethanol and NaOH). This creates 6-ethoxycarbonyl-3,5-diphenyl-2-cyclohexenone.

1) A white solid remains in centrifuge tube after acetone extraction-it fizzes when hydrochloric acid is added suggesting sodium carbonate was formed- How did it form? Write a balanced equation for the formation?

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Hi there,

Thanks for letting me work on your question. Here is what I think:

Given the presence of carbon dioxide in ...

Solution Summary

This solution explains how chemical reaction of NaOH in the air contributes to the formation of white solid.