BENEDICT. — DOUBLE HALOIDS. 213 



described as deliquescent, turns yellow in the air, crystallizes in 

 leaves, and is decomposed by water and heat. " L'eau mere aban- 

 donnee a une evaporation spontanee donne des hexaedres compose's 

 de SbCl 3 . 2 KC1." 



Thus confusion arises regarding the salt SbCl 3 . 2 KC1, as Jacque- 

 laine states the crystalline form to be an oblique rhombic prism, while 

 Poggiale maintains that it is cubical. 



Gmelin * states, " The aqueous solution of a mixture of two atoms 

 of chloride of potassium and one atom of terchloride of antimony 

 yields oblique rhombic prisms (Jacquelaine)." Jacquelaine's analysis is 

 added. Formula SbCl 3 . 2 KC1. " SbCl 3 . 3 KC1 crystallizes in lam- 

 inae ; deliquescent; decomposed by boiling water (Poggiale)." 



Pelouze and Fremy f state that Sb 2 Cl 3 forms many double chlo- 

 rides with metals, especially alkaline chlorides. The general formula 

 for these is (MCl) 3 Sb 2 Cl 3 . Chloride of potassium forms, however, 

 two salts, (KCl) 3 Sb,Cl 3 and (KCl) 2 Sb 2 Cl 3 . 



Watts's Dictionary t states : " By mixing concentrated solutions 

 of SbCl 3 and alkaline chlorides, and evaporating, double salts are 

 formed, e. g. : 



3 KC1 . SbCl 3 , and 3 KC1 . SbBr 3 , etc." 



Storer § mentions two salts : 



(a) 2 KC1 . SbCl 3 , soluble in water without decomposition, more 

 soluble than (6) in water (Jacquelaine). 



(5) 3 KC1 . SbCl 3 , deliquescent, decomposed by hot water (Pog- 

 giale). 



Graham-Otto || states that SbCl 3 forms double crystalline salts, with 

 the chlorides of the alkaline and earthy alkaline metals. 



FehlinglT mentions two salts: 



(a) 3 KC1 . SbCl 3 , crystallizes in leaves, and is efflorescent. 



(b) 2 KC1 . SbCl 3 , crystallizes in triclinic prisms. 



Romanis ** gives the specific gravity of a salt, to which he assigns 

 the formula SbCl 3 „ 3 KC1 . 2 H 2 0, as 2.42. But no method of its 

 preparation or reference to previous work is given. This value is 



* Handbook of Chemistry, Cavendish edition, Vol. IV. p. 381. 

 t Chemie General, Vol. III. p. 160. 

 t Edition 1888, Vol. I. p. 287. 

 § Dictionary of Solubilities, p. 149. 

 || Michaelis edition, Vol. II. p. 555. 



11 Neues Handworterbuch der Chemie, ed. 1872, Vol. I. p. 670. 

 ** Chemical News, XLIX 273. * 



