<P> Strong bases deprotonate bilfluoride . For example, calcium hydroxide gives calcium fluoride . </P> <P> Sodium bifluoride is produced by neutralizing waste hydrogen fluoride, which results from the production of superphosphate fertilizers . Typical bases are sodium carbonate and sodium hydroxide . The process occurs in two steps, illustrated with the hydroxide: </P> <Dl> <Dd> HF + NaOH → NaF + H O </Dd> <Dd> HF + NaF → NaHF </Dd> </Dl> <Dd> HF + NaOH → NaF + H O </Dd>

Hf forms two types of compound naf and nahf2