ON AMMONIACAL PLATINDM BASES. 65 



boiling water and recrystallisation. By the action of amraonia upon a solution of pro- 

 tochloride of platinum in hydrochloric acid, several compounds are formed, viz: 



Insoluble Dissolved in the' liquid 



1. The chloride of Platoseraidiaminine 4. Chloride of platodiaramine 



2. The green chloride of Magnus 5. Chloride of platomonodiammine. 



3. The chloroplatinite of platomono- 

 diammine. 



The relative quantities of these compounds depend on the temperature, the quan- 

 tity of ammonia, and perhaps on other circumstances. If the solution is cold and acid, 

 the chloroplatinite of platomonodiammine tirst separates, mixed with some green need- 

 les, afterwards a large quantity of the chloride of platosemidiammine is precipitated, 

 the almost colourless liquid containing the dissolved chloride of platodiammine and 

 platomonodiammine. The chloroplatinite of platomonodiammine is only prepared 

 from this mother-liquid, by adding to it a solution of chloroplatinite of potassium in 

 excess, wlien a large quantity of a voluminous green precipitate of the chloroplatinite 

 of platodiammine, mixed with the chloroplatinite of platomonodiammine is thrown 

 down. If the liquid and the precipitate are heated up to boiling, and quickly filtered, 

 the filtered solution deposits on cooling, nne ehamois-coloured, glit-tering, and very thin 

 quadratic scales. This is the pure chloroplatinite of platomonodiammine. This com- 

 pound ha- been the starting point for the preparation of all the other compounds of 

 the base. I always obtained it in verv small quantities, which is the reason of my 

 having studied no more compounds of the base, than the few here described. I have 

 tried to prepare the chloride of platomonodiammine by adding diluted ammonia to a 

 boiling solution of the chloride of platosemidiammine, but with no success. Once I 

 obtained a verv small quantity of the chloride of platomonodiammine by heating the 

 chloride of platodiaramine. 



The chloroplatinite is also obtained on adding a solution of protochloride of 

 platinum to solutions of compounds of platomonodiammine. 



The double chloride is soluble in boiling water, and recrystallises again on coo- 

 ling the solution If boiled with permanganate of potassium and hydrochloric acid it 

 tirst yields yellow octahedrons, which are beyond doubt chloroplatinate of potassium. 

 The mother-liquor yields by evaporation hexagonal and rhombic leaves, which are in 

 all likelihood the chloride of platinmonodiammine. 



Nitrate of silver and the double chloride yield a brown curdy precipitate, which, 

 with hydrochloric acid, gives protochloride of platinum, that dissolves and chloride of 

 silver that remains. The liquid, separated from the brown precipitate of chloroplati- 

 nite of silver gives, by evaporation. easily soluble crusts of the nitrate of platomono- 

 diammine. The double chloride does not contain water. 



Analysis: 

 0,2510 gr. gave 0, 1 630 gr. platinum and 0,2410 gr. chloride of silver =0,0596 gr. 

 chlorine. 



Q 



K. Vel Aka.l. Handl. Ii. 1» N:o '.'. " 



