OH band in IR of propyl ethanoate? [closed]

In lab I combined 1-propanol with acetic acid to make propyl ethanoate. I obtained an HNMR and an IR of the product. The HNMR suggests that the product was successfully synthesized. The IR has the correct bands for the expected product, but it also has an OH peak. What would this band be?

closed as off-topic by Todd Minehardt, airhuff, Klaus-Dieter Warzecha, M.A.R., WildcatMar 26 '17 at 17:57

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• Any extra peaks in your HNMR, maybe something near 1.5 ppm? – orthocresol Mar 26 '17 at 0:34
• What is the shape of this "OH" peak? Is it the typical broad hump or is it more like a small spike with a broad shoulder? That second one is the overtone for the carbonyl peak. – Ben Norris Mar 26 '17 at 0:50
• How did you purify the compound and have you been careful about making sure that the sample is dry? – Zhe Mar 26 '17 at 13:42

The presence of remaining propanol may be confirmed by 1H NMR, too (remember that solvents like $\ce{CDCl3}$ more likely provide an OH signal that is broad, while d6-DMSO with slow H-D exchange rates a multiplet signal; and a droplet of $\ce{D2O}$ may mute the OH-signal completely).