Tests on Vanadium Compounds

2 ANALYTICAL CHEMISTRYOF VANADIUM COMPOUNDS 10.2.1 Tests on Vanadium Compounds 

Prepare a solution of VOSO4 in dilute sulphuric acid and add to separate portions  

Add Mg turnings gradually to an acidified solution and add separately the supernatant to each of the following  

Place zinc dust in a separating funnel, add acidified vanadyl (IV) solution and close with a stopper carrying a Bunsen valve. Shake well and allow to stand with intermittent shaking. Add to aliquots of the filtrate, each of the following solutions  

Weigh out accurately about 0.9 g of the blue crystals. Dissolve in dilute sulphuric acid and make up to 2S0 cm with the acid in a volumetric flask. Pipette 25.0 cm of the solution into a conical flask, add an equal volume of the acid and titrate with standardised (about 0.02 M permanganate) until a drop produces a faint permanent pink colour superimposed on a faint yellow. Repeat to obtain concordant results and calculate from the average titre the molar concentration of VOSO4 and its mass. Hence calculate x in the formula. 

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