I would like to thank you for this interesting useful site. I am a student and I have a research project regarding HCl product. I have a problem with changing color for HCl 30%: when it's stored it becomes reddish. I don't know why and I want to know what is the possible reasons for this problem. Is this changing in color due to iron content or storage material?
Your help is highly appreciated
Salah Alomar Kuwait University - Kuwait ^
A. HCl will turn a tan or off yellow or yellow green with age, but not red or orange or dark brown. You very probably have contaminated it.
James Watts - Navarre, Florida ^
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