CHEMICAL PROPERTIES 



731 



Table 7-1 

 Some Properties of Mercury, the Mercuric Ion, and the Mercuric Halides 



Radii 

 Hg atom 

 Hg++ ion 



Bond lengths 

 Hg-Cl 

 Hg-Br 

 Hg-I 



Bond ionic character 

 Hg-Cl in HgCIs, 



Bond types 

 HgCl, 

 HgClr 



Electronegativity 

 Hg(II) 



Solubility in water (g/100 ml solution] 

 HgCl, 



Solubility product 

 HgCl, 

 K,^= (Hg++)(C1-)^ 



pH of saturated solution 

 HgCl, 



Redox equilibrium 

 Hg++ + Hg(I) ±^ Hg,++ 

 K = (Hg,++)/(Hg++) 



Redox potentials {E\r,o) 

 Hg2++ ±^ 2 Hg++ + 2e- 

 2 Hg ±5 Hg2++ + 2e- 

 Hg ±? Hg++ + 2e- 



1.59 A 

 0.66 A 



2.20 A 

 2.40 A 

 2.55 A 



28% 



Linear {sp) 

 Tetrahedral (sp') 



1.9 



6.8 (25°) 



8.9 (37.5°) 



1.06 X 10-" (25°) 

 2.95 X 10-i» (37.5°) 



4.7 (25°) 



129.2 



- 0.92 V 



- 0.79 V 



- 0.85 V 



