Hydrofericyanic or Hydroferricyanic: How To spell?
The word Hydrofericyanic is misspelled against Hydroferricyanic, a noun meaning "Pertaining to, or containing, or obtained from, hydrogen, ferric iron, and cyanogen; as, hydroferricyanic acid. See Ferricyanic."
Hydroferricyanic has double "rr" is mispronounced as "r"Remember double 'RR' in between the strings hydrofe & icyanic which should not be misspelled with single 'R'
Wrong Spelling:  hydrofe-r-icyanic  Correct Spelling:  hydrofe-rr-icyanic 
Find more incorrect spellings of Hydroferricyanic to spell right way.