IMIDOSULPHO .NATES. 85 



in diammonium iiiiidosiilphonate aoliition, this quantity being in the 

 propoj-tion, Cii(OH)o : Am2HN(S03),,. The salt rapidly crystallises 

 after the dissolution of the lime. It has not been analysed. 



Galcmm sudiuni iniidosidplioiiak'. — To a hot (-(jncentrated solution 

 of trisodium iniid(jsiilph()nate about the ciilculated quantity of calcium 

 chloride solution to form the tricalcium salt is added, and the mixture 

 left to cool. N^ot the tricalcium salt Ixit the calcium sodium salt 

 crystallises out in groujis of hard brilliant prisms. The salt can be 

 recrystallised, and thus purified if necessary. It is sparingly soluble 

 in c<jld water, and reacts alkaline. It only very slowly takes carbonic 

 acid from the aimosphere. Analysis corresponds to the composition 

 CaNaN(S03)2,(OH,)3— 



Calo. Found. 



Calcium 13-75 18-95 1407 — 



Sodium 7-90 7-72 — — 



Sulphur 21-99 — •22-21 — 



Nitrogen 4-81 — — 4-88 



The relative positions of the calcium and sodiimi are not very 



certain. For sake of symmetry the sodium might be put in the 



imide relation, but such a procedure has nothing to support it. 



Taking the sodium to act as the more basylous element, the formula 



becomes — 



^N 



'SOsNa 



oa 



SOsNa 



Lead iiiiidosidphonaies. 



A lead imidosulphonate was used l)y Jacquelain, and again by 

 lîergluad, to prepare imidosulphonic acid ; but we know of n(3 

 publication of particulars concerning the sail employed. 



