On the Experimental Consideration on Addition Compound of Sodium Pyrophosphate with Hydrogen Peroxide

Abstract

For the production of addition compoumd (peroxyhydrate) of sodium pyrophosphate with hydrogen peroxide, 3-5 moles of hydrogen peroxide were added to 1 mole of sodium pyrophosphate under carefully controlled conditions, thereafter a compound of such formula as Na4P2O7·2H2O2 which was the most stable was obtained. It was crystalline material and relatively stable to heating (see Fig. 2). The properties of an aqueous solution of the compound (peroxyhydrate) were similar to those of an aqueous hydrogen peroxide solution: Deep blue, ethersoluble peroxychromic acid and yellow peroxytitanic acid were formed, and also permanganate was decolored, and iodide was not oxydized to iodine at neutral solution (see Table 2).The IR spectra of sodium pyrophosphate and its peroxyhydrate were examined by means of the nujol method. The strong characteristic absorption of sodium pyrophosphate were found at near 920cm-1 and near 730cm-1. The finding suggested the vibration of P-O-P linkage. While, the spectrum of peroxyhydrate appeared to be shifted to the region of higher wavelength (near 880cm-1 and 707cm-1), and showed the new absorp. tion at near 3050cm-1, 2680cm-1 and 1405cm-1.These data indicate that the samples are not a mixture of hydrogen peroxide and sodium pyrophosphate. The mole ratio of combined hydrogen peroxide in samples “O” and “N” were 1.74 and 1.78, respectively.