Ferrous salt solutions

Upon boiling the alkaline ferrous salt solution, some ferric ions are inevitably produced by the action of the air upon the addition of dilute siilphurio acid, thus dissolving the ferrous and ferric hydroxides, the ferrocyanides reacts with the ferric salt producing ferric ferrocyanide (Prussian blue) ... 

Kiyama, M. Takada,T. (1972) Iron compounds formed by aerial oxidation of ferrous salt solutions. Bull. Chem. Soc. Japan 45 1923-1924... 

The estimation of a vanadate solution by direct titration with ferrous sulphate or ferrous ammonium sulphate solution has been worked out, and is found to be specially applicable to the analysis of vanadium alloys. The vanadate is again reduced to tire tetravalent state by the ferrous salt, the end point being obtained by the use of potassium ferricyanide as internal indicator alternatively, a known excess of the ferrous salt solution is added to the vanadate, the amount unused... 

The pitting corrosion of copper has been inhibited by injection of ferrous salt solution. Ferrous ion injection probably results in the formation of lepidrocrocite, FeO.OH, and provides protection. 

The most reliable values of pQ are based on the mFe (II) analysis in solutions of known ionic strength. This approach is applicable in mixed ferric-ferrous salt solutions as above, or in ferrous salt solutions. An equation relating pQ to solution composition may be derived as follows. For the reduction reaction... 

The nitrite solution is added to a known quantity in excess of ceric sulfate. The excess is titrated with a ferrous salt solution or with an oxalate solution with ferroin or N-phenylanthranilic acid as the indicator. The oxidization reaction is... 

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