Mercuric oxalate

Mercurous Oxalate. Hg2C 2O4, mw 489.22, wh cryst powd. Prepd by Souchay Lenfsen (Ref 2) by treating sol mercurous salts, such as the nitrate, with oxalic acid. Insol in cold w, ale eth decompd by hot w insol in dil sulfuric acid sol in dil hydrochloric and nitric acids... 

Warren (Ref 4) evaluated mercuric oxalate as a possible replacement for MF in primer compns, and concluded that it lacked the sensitivity necessary for an initiating agent. Sensitivity data obtained are given below ... 

Mercuric oxalate (HgCiC ) appears to undergo decompn by a somewhat different mechanism with the formation of Hg and mercurous oxalate... 

The improvement in the preparation of renewable and reproducible mercury film-covered carbon paste electrode for use in anodic stripping voltammetry has been reported in Ref. 39. Mercury salts (mercuric oxalate) distributed in the electrode bulk served as a source of mercury. 

Apart from the impurities that influence its colour, mercury fulminate may contains a trace of mercuric oxalate, the presence of which was discovered by Shish-kov [19] as early as 1856. Oxalic acid is always formed during the reaction as a byproduct resulting from the oxidation reaction and according to Solonina the amount of oxalic acid formed is larger if hydrochloric acid is present in the reaction mixture. 

HgC204 (c). Berthelot90 measured the heat of solution of mercuric oxalate in 4HC1(100). 

Assuming that the rate at which the thickness of the product phase, y, increases (Eq. 2.49), independent ofy, as represented by Eq. (2.53), yields Eq. (2.54). Prout and Tompkins reported that the decarboxylation of mercuric oxalate (Hg2C204) conforms to Eq. (2.54).268... 

Bergman found that silver and mercurous oxalates blacken in sunlight. Scheele found that metallic silver is formed in silver chloride blackened by light, and that it grows black sooner in the violet than in any of the other rays , the first distinction of the different chemical effects of light of different colours. He seems to have known of Schulze s work. ... 

The side products of the reaction include ethylnitrate, ethylnitrite, oxalic acid, nitrogen oxides, and carbon dioxide. The raw MF ordinarily contains metallic mercury, mercuric oxalate, calomel, and mother liquor enclosed in crystals [15]. Traces of free mercury can be removed from MF by evaporation by placing it in vacuum desiccator for a few days [38]. The only industrially used method of preparation of MF is the one described above. The technology is described in great detail in the literature [3, 15, 35, 42, 48]. 

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