34 Notices of the Labours of Continental Chemists. 



of pink salt. The potassium salt is similar in form to the pre- 

 ceding ; when heated, it leaves chloride of potassium and oxide 

 of tin. Its formula is K Cl^ Sn CI*. The sodium compound 

 is very soluble in water, effloresces in warm air; when heated 

 to 100° C. smells of the bichloride of tin, and loses from 12 

 to 1 3 per cent, water. — A?malen der Cheviie und Pharmacies 

 vol. xxxix. p. 100. 

 On the Compounds of the Chloride, Iodide a7id Cyanide of 

 Palladium isaith Ammonia. 

 Fehling has examined these salts; the palladium was deter- 

 mined by carefully heating them. The nitrogen and hydro- 

 gen were determined by combustion with oxide of copper, 

 &c. On adding excess of ammonia to a cold, not too dilute, 

 solution of chloride of palladium, a red precipitate is formed ; 

 this salt was known to Vauquelin. Its formula is Pd Cl^ 

 -f- N'^ H'*. By boiling water it is dissolved and decomposed ; 

 there is a small brown residue which contains the same ele- 

 ments as the red compound, but less chlorine; the other 

 product is a yellow salt, identical in composition with the 

 red one, which turns yellow when heated to 200° C. A si- 

 milar yellow salt is precipitated by acids from the solution 

 which has been filtered from the red salt, and also from a 

 solution of the red salt in aqueous ammonia. Both the red 

 and the yellow salts dissolve in nitric acid with a brown co- 

 lour, and give on evaporation a brownish red, very soluble 

 mass, from whose solution ammonia always throws down the 

 red compound. They both dissolve in ammonia, but with 

 different degrees of rapidity. By evaporating the ammoniacal 

 solution and continually adding ammonia, a white salt is ob- 

 tained. Formula Pd CF + 2WW^-W O. Both the yellow 

 and white salts absorb ammonia, the yellow more quickly ; the 

 above white salt is thereby produced : this compound is soluble 

 in water, gives with acids the yellov/ salt, when heated loses 

 one atom of ammonia and one of water. 



Iodide of palladium dissolves easily in ammonia; and on the 

 addition of hydrochloric acid a reddish-yellow precipitate is 

 formed, which, by boiling with water, is converted into a red 

 crystalline mass, having just the same formula as the yel- 

 low salt, viz. Pd r- + N^ H^. A white compound, Pd P 

 + 2 N'-^ H^', may be obtained in exactly the same manner as 

 the analogous chlorine compound. 



Cyanide of palladium dissolves in ammonia when heat is 

 applied; on cooling, the compound, Pd Cy'- + N^ H", crystal- 

 lizes out in the form of needles. This body does not absorb 

 moist ammonia, &c. — Annalen der Chemie und Pharmacie, vol. 

 xxxix. 



