29 G Mr. G. S. Johnson. 



(2.) Solubility in Alcohol of Sarcous Kreatinin. 



14-9815 grams of solution of sarcous kreatinin in alcohol of sp. gr. 



0-800, saturated at 13*7 C.', left, on evaporation, 0*0305 gram of 



kreatinin. 

 Therefore, 14*9510 grams of alcohol dissolved 0*0305 gram of 



sarcous kreatinin at 13' 7 C. 

 Hence, 1 part of kreatinin dissolves in 490'2 parts of alcohol at 



13-7 C. 



(3.) Properties of the Platinum Salt of Sarcous Kreatinin. 



When sarcous kreatinin is dissolved in dilute hydrochloric acid, 

 and a solution of platinic chloride added, an orange-coloured platinum 

 salt separates out in crystals on evaporation over sulphuric acid. 

 This platinum salt resembles that of urinary kreatinin in containing 

 2 mols. of water of crystallisation, which are expelled at 100 C., 

 leaving the anhydrous salt as a lemon-yellow mass. 



2*8577 grams of air-dried platinum salt of sarcous kreatinin lost 

 0*1567 gram of water at 100 C., becoming 2' 7010 grams of 

 anhydrous platinum salt. 



These numbers correspond with a loss of 5 '47 per cent. H 3 0. 



Required for 

 2(C 4 H 7 N 3 O.HCl).PtCl 4 .2H 2 O. Found. 



5'34 per cent. H 2 0. 5*47 per cent. H 2 0. 



In calculating the percentage composition of the platinum salt of 

 sarcous kreatinin, I have adopted the following atomic weights : 



C = 12, H = 1, N = 14, O = 16, 01 = 35-5, Pt = 194*4. 



0*5288 gram of platinum salt of sarcous kreatinin, dried at 100 C., 

 left, after ignition, 0*1628 gram of platinum. 



According to these numbers, the dry platinum salt contains 30*78 

 per cent, of platinum. 



Required for 



2(C 4 H 7 N 3 O.H01).PtCl 4 . Found. 



30-59 per cent. Pt. 30'78 per cent. Pt. 



Determination of the Solubility in Water of the Platinum Salt of 

 Sarcous Kreatinin. 



3'942 grams of solution of the platinum salt of sarcous kreatinin in 

 water, saturated at 15 C., left, on evaporation at 100 C., 0*167 

 gram of dry platinum salt. 



According to these numbers, 22'6 parts by weight of water dissolve 

 1 part by weight of the platinum salt. 



