Question

What is the frequency range in `"cm"^(-1)` of `-OH` in water using infrared spectrometry?

Answer 1

I assume you mean for the `"OH"` stretch of water in the IR region. Organic `"OH"` stretches are typically around the `3200 ~ 3500` `"cm"^(-1)` range.

For water, it's a combination band of the symmetric stretch (`nu_1`), asymmetric stretch (`nu_3`), and symmetric bend (overtone of `nu_2`) motions:

This is a Raman spectrum, but this particular vibrational motion is active in both Raman and IR, so this is a suitable proof of the frequency range.

You can see that its range is somewhere around `bb(3200 ~ 3600)` `bb("cm"^(-1))`. This website reports it as `3404.0` `"cm"^(-1)`.