The oxidation of methanol to formaldehyde can be accomplished by reaction with chromic acid: 6H+ + 3CH3OH + 2H2CrO4 → 3CH2O + 2C
r3+ + 8 H2O(l) The reaction can be studied with the stable isotope tracer 18O and mass spectrometry. When a small amount of CH318OH is present in the alcohol reactant, CH218O forms. When a small amount of H2Cr18O4 is present, H218O forms. Does chromic acid or methanol supply the O atom to the aldehyde?
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