六氰合铁(Ⅲ)离子对抗坏血酸氧化还原平衡常数的测定

Determination for equilibrium constant of oxidation-reduction reaction between [Fe(CN)_6]^(3-) and vitamin C

介绍了一种通过测定电动势确定六氰合铁 ( )离子对抗坏血酸氧化还原平衡常数的实验方法 ,当体系 p H=2 .2 ,温度 =2 5℃时 ,E=0 .1 58v,k=1 0 ,误差 =± 8% ,该法的优点是方便 ,快捷 ,易于进行学生实验。

Equilibriun constant of oxidation reduction reaction between Fe(CN) -3 6 and vitamin C had been determinated by measure of the electromotive force of the cell.The result indicated that if pH=2.2 and t=25 ℃,then the electromotive force E=0.158v. and equilibrium constant k=10.It is proved that this method is fast and easy to use.