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2. Notice of an Easy Method of Preparing Nitroprussides

Published online by Cambridge University Press:  15 September 2014

Lyon Playfair
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Extract

Since I described the method of making nitroprussides by the action of nitric acid on yellow prusside of potassium, Hadow (Chem. Soc. Journal, 1866) has given a more productive process, by treating potassic ferridcyanide with an equivalent quantity of mercuric chloride, of sodic nitrite, and of acetic acid. Hadow contends that N2O3 substitutes Cy2 in this reaction, instead of NO as supposed by me. I am still of opinion that the formula of nitroprussides is FeCy5 NOM2. For if an equivalent quantity of an acid be added to a solution of potassic ferridcyanide, and a stream of NO be passed through this solution, at a temperature of between 70° C and 80° C, nitroprusside is slowly but abundantly formed, with the evolution of hydrocyanic acid.

Type
Proceedings 1866-67
Information
Proceedings of the Royal Society of Edinburgh , Volume 6 , 1869 , pp. 90 - 92
Copyright
Copyright © Royal Society of Edinburgh 1869

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References

page 90 note * I prefer for this purpose sodic nitrite, made by fusing lead with sodic nitrate, lixiviating with water, and then adding H2SO4 cautiously, till the lead is precipitated.

page 91 note * If the solution, on mixture, instead of being boiled, as recommended, be kept cool, a large quantity of nitroprusside is still formed, and a considerable amount of oxamide is deposited.