My teacher pronounces aqueous as "ay-kwee-ous", and as a result that's what my class has learnt.
However, I've become aware through several pronunciation guides (including Howjsay.com and a pronunciation video on YouTube) that "ah-kwee-ous" is seemingly a more common variant. The Yahoo dictionary lists both variants, with the "ah" version first. Dictionary.com also lists both, but the audio clip is of the "ay" version.
So what is most common/correct, and what should be used?