Double Salts of Mercury. 239 



The ChlorO'Cyanide of Magnesium and Mercury, 



This salt is obtained by dissolving together in water 12 

 parts of chloride of magnesium with 60 parts of bicyanide of 

 mercury. It crystallizes like the other salts in flattened qua- 

 drangular prisms ; it is not deliquescent, easily dissolves in weak 

 alcohol, from which it readily crystallizes. 1 grains of the 

 salt were submitted to the same mode of analysis as that 

 adopted for the salts above described. 



7''1?5 grains of bisulphuret of mercury = 8*10 of bicyanide, 



the calculated proportions being 7*736 bisulphuret = 8*4? 1 



bicyanide of mercury. The chloride of magnesium obtained 



weighed 1*5 grain, the calculated proportion being 1*59. 



The results of experiment and calculation will therefore give 



Experiment. Calculation. 



Bicyanide of mercury 8*10 8*41 



Chloride of magnesium ... 1*50 1*59 



Loss *40 



10-00 10-00 



The atomic representation of this salt will therefore be 



Bicyanide of mercury 255*72 = 1 atom. 



Chloride of magnesium ... 48*15 = 1 atom. 



303*87 atom, weight of salt. 



2 



And its symbol {J^g Cy f Mg CI). 



The Chloro- cyanide of Barium and Mercury^ 

 Obtained by dissolving together in water 24 parts of chloride of 

 barium and 60 parts of bicyanide of mercury, evaporating and 

 crystallizing; it assumes the quadrangular flattened prismatic 

 form, and is precipitated by the solutions of the soluble sul- 

 phates. It dissolves easily in weak alcohol, from which it 

 may be readily obtained in crystals. 



Ten grains submitted to analysis yielded %'S grains of bi- 

 sulphuret of mercury = 7*07 of bicyanide, the calculated pro- 

 portions being 6*53 bisulphuret = 7*10 bicyanide of mercury. 



The chloride of barium obtained weighed 2-8, the calcu- 

 lated proportion being 2-9 grains. 



The results of experiment and calculation therefore give 



Experiment. Calculation, 



Bicyanide of mercury ... 7*07 7*10 



Chloride of barium 2-80 2*90 



Loss *13 



10-00 10-00 



