# Question #33fdd

Jul 27, 2014

The formula is LiHCO₃.

Since the compound contains a metal, it must be ionic. It must consist of M ions and HCO3 ions.

The formula for an HCO3 ion is HCO₃⁻, so the metal ion must be M⁺.

M must be an alkali metal; Li, Na, K, Rb, or Cs. All these form ions with a charge of +1.

Wikipedia states that all the alkali metals except Li can form compounds with oxidation number -1. I haven't been able to find examples of such compounds.

If we take Wikipedia at its word, the metal must be lithium.

The formula is then LiHCO₃.