Ramanjaneyulu, J.V.S.Shukla, B.K.2011-11-252011-11-252011-11-25http://hdl.handle.net/1968424/117Effect of varying the concentration of sodium fluoride This shows that amount of sodium fluoride most be about 15-20 times that the amount of ferric iron for forming the stable complex, which does not break within half an hour when the overall acid concentration is 0.32 N and overall iodide concentration is 0.01 N.enArticle