# Do formic acid and phosphorus pentoxide react at room temperature?

If I add phosphorus pentoxide to formic acid at atmospheric pressure and 20°C will they react? At what rate will CO be produced?

I have not been able to find a reference discussing this.

• I have no particular knowledge about this, but P4O10 dehydrates many stable substances. Formic acid is not stable, very slowly decays to H2O and CO, so it is adviced not to keep it very tight closed. So I predict it may be vivid to violent reaction. – Poutnik Oct 30 '20 at 15:34
• Using sulphuric acid instead is the laboratory method to produce CO. – Poutnik Oct 30 '20 at 15:51
• Also, P2O5 is a stronger dehydrating agent than H2SO4. – Ivan Neretin Oct 30 '20 at 17:53

$$\ce{P2O5 + 3 HCOOH -> 3 CO (g) + 2 H3PO4}$$