340 



Mr. W. J. Sell and Prof. W. J. Lewis. [Feb. 14, 



Carbonatoperiodide No. 1. 



When a solution of the normal iodide is mixed with ammonium 

 sesquicarbonate and a solution of iodine in potassium iodide carefully 

 dropped in, a yellowish precipitate is produced consisting of fine 

 silky needles. The crystals are insoluble in water and other neutral 

 solvents, and decomposed by acids with effervescence and separation 

 of free iodine. Examination of this remarkable substance led to the 

 formula (CON 2 H 4 ) 12 Cr 2 (C0 3 ) 2 I* being assigned to it. 

 The following results were obtained on analysis : 

 The numbers refer to the compound dried in vacua over sulphuric 

 acid. 



1. 0-4178 gram gave 0*27695 gram Agl. 



2. 0-6570 0-4375 



3. 0-6158 on treatment with HC1 0'036 gram CO 2 . 



4. 0-5217 on ignition 0'0547 gram Cr 2 3 . 



5. 0'341 gram dissolved in dilute HC1 required 4" 15 thiosulphate : 



each c.c. = 0'0380975 I. 



6. 0"198 gram dissolved in dilute HC1 required 2*45 c.c. same 



thiosulphate. 



