Jntelligefice and Miscellaneous Articles. WQ 



This oxide may probably be ithe Stsuanate of protoxide of tin, difeco- 



veredbyM. Fremy (SnO, SnaQG). ; : n , 



:, ., , Qxide of Chromium, "when dissolved in potash and heated with the 

 ferridcyanide to the boiling-point, is converted into chromiite of pot- 

 ash ; and if sufficient oxide be used, all the ferridcyanide is reduced 

 to ferrocyanide ; this is evidently an exanaple of very energetic oxi- 

 dation, for hitherto chromate of potash has not been procured in the 

 moist way. ,s\ :, a> \> .-,^v.^iv''\ 'iV. ,,vn\\ov. .>,;,.' : -.u^u-,,-' i ■ .m.^ •..•;..!' 



Oxides of Gold and Silver are not superoxidized by the ferridcya- 

 nide ; in a cold solution no effect is produced, but at a temperature 

 near that oi ebullition, peroxide of iron is precipitated ; and the so- 

 lution contains ferrocyanide of potassium, and cyanide of gold dis- 

 solved in the cyanide of potassium. 



•: The salts of silver exhibit similar phsenomena, viz. the formation 

 of ferrocyanide, precipitation of peroxide of iron ; and the solution 

 contains ferrocyanide of potassium, which being precipitated by al- 

 cohol, cyanide of silver and cyanide of potassium were obtained. 

 These facts are not included in simple oxidizement, they are true 

 decompositions. 



Sulphur may also be oxidized by this same influence ; it becomes 

 sulphuric acid. ... ; . 



Acids and Salts. — Certain mineral acids may be oxidized, whether 

 free or combined; phosphorous acid and the soluble hypophosphites 

 are converted into phosphates ; sulphurous acid yields sulphuric acid, 

 the sulphites ai'e converted into sulphates. Oxalic acid, and oxalates 

 added to the alkaline solutipn, yield carbonates almost instantane- 

 ously. :,.:i;in:i!C Jli} :{U'/.l.io-l([ :'-l jiOiiiV^ JjjmjjJoo. UC 'l:- 



M. Boudault gives the following explanation of the phsenomena 

 which he has described : — the ferridcyanide of potassium is consi- 

 dered by him as a double salt, that is to say, as a compound of per- 

 cyanide of iron and cyanide of potassium ; this percyanide of iron, 

 therefore, does not exist in a free state, and being a very unstable 

 salt, it is retained in the red prussiate by the cyanide of potassium. 

 As soon as a reaction takes place in the presence of this salt, it has 

 a tendency to be decomposed, and the author gives the following as 

 explanatory of his views : — »;.:jui. 



^ Cys Fe2 + Cy3 K^ = Cy'^ Fe^ + Cy^ K^ + Cy . V^ ^^^*'^'^^ 



On adding potash and oxide of lead, we have' ^^"f j ' .„ „ 

 ^ , , Py^Fe^Cy^K^ + Cy -H K + Ph^^^^ ,rf;*„, y 

 .. , . ^ ,,,y. =?;Cy°-Fe"-Cy=*K3+ CyK-f-PbO^up -^^^ ^^^^ j, 

 .ijij^l io iiiig ^r. = 2CyFe Cy^K^ + PbO^juiiinini. boai^jdotoiiiVA ti'U 

 By this formula we find two equivalents of • fiitbb^iifnroS of '^yota^^iii 

 and binoxide of lead, which is what we obtain by the reaction which 

 it explains. 



-The author considers the ferridcyanide of potassium, und&r the 

 circumstances described, as ferrocyanide, minus potassium, and con- 

 sequentlj'^ as possessing an equivalent of free cyanogen, capable of 

 replacing eyauegen. It is therefore demonstrated, M. Boudault 

 oncludes, that cyanogen possesses the additional analogy with chlo- 



