Oxidation—continued with mercuric acetate

Fig. 7. Continuous recording of the limiting current Oxidation of fAreo-l,2-diphc-nylethyleneglycol by periodate. Decrease in the periodic acid concentration with time. 1M Acetate buffer of pH 4.3, 5 x 10 5 M-KIO4, 5 x 10 8Af diol. Current recorded at 10.4 V (mercurous sulphate reference electrode) at 15° C. Figures on the abscissae give the time in minutes the galvanometer zero and the current before the addition of periodate and after addition at / = 0 are marked. Full scale sensitivity 0.8 [zA...

Acetic Acid Dilute 1 mL of sample to 100 mL with water, transfer 50 mL of this solution into a 250-mL boiling flask, and add 5 g of yellow mercuric oxide. While continuously stirring, boil the mixture under a reflux condenser for 2 h, cool, filter, and wash the residue with about 25 mL of water. Add phenolphthalein TS to the combined filtrate and washings, and titrate with 0.02 N sodium hydroxide. Not more than 2.0 mL of 0.02 N sodium hydroxide is required to produce a pink color. 

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