Abstract
Abstract (1) The potentiometric titrations of potassium and sodium ferrocyanide with mercuric chloride, nickel sulphate and cobaltous sulphate by using platinum electrode as an indicator electrode were studied at 25°C. (2) From the above titration we found that the reactions take place as follows. 2Hg^+++Fe(CN)_6^-— &=Hg_2Fe(CN)_6 2Ni^+++Fe(CN)_6^-— &=Ni_2Fe(CN)_6 2Co^+++Fe(CN)_6^-— &=Co_2Fe(CN)_6 (3) Also the potentiometric titrations were compared with potassium and sodium ferrocyanides by ferric chloride and silver nitrate solution at the same condition or different conditions, and a very good agreement was found with each other. (4) In this titration we found that the reaction takes place as reported already by Niemz(1) at the case of silver and in other case as follows: & 4Ag^++Fe(CN)_6^-—=Ag_4Fe(CN)_6 & 4Fg^++++3Fe(CN)_6^-—=Fe_4[Fe(CN)_6]_3
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