# Making carbon monoxide gas from formic acid and sulfuric acid?

Can I create carbon monoxide gas by just mixing formic acid and sulphuric acid together? Or do they have to be heated?

• If you have pure, relatively concentrated formic acid, and pure, very concentrated sulfuric acid, then I don't think you need to do any heating. BTW, creating CO gas is very very dangerous! Please don't do it. ncbi.nlm.nih.gov/pubmed/18363119 – Curt F. Jul 18 '15 at 3:31

The generated gas contains various impurities, which can be removed using gas washing bottles. Usually, the gas is passed first through $\ce{KOH}$ solution; however, you should take care to prevent any backflow of $\ce{KOH}$ solution to the sulfuric acid.