234 



EDWARD DIVERS AND TAMEMASA HAGA: 



much of the nitric acid (by ether extraction), but also much of the 

 amidosulphonic acid, by getting it deposited when the mixed acids, 

 holding it suspended, were poured upon ice to dilute them. In our 

 experiments, we used the amidosulphonic acid in form of its ammonium 

 salt, with the object of having the acid present in the finest state of 

 division. 



As has just been indicated, amidosulphonic acid is oxidised in the 

 cold by nitric acid in presence of concentrated sulphuric acid. It is 

 also oxidised by hot or even cold nitric acid, by potassium chlorate and 

 hydrochloric acid (Berglund), and by chlorine and bromine. It is not 

 acted upon by chromic acid or permanganic acid solution or by ferric 

 chloride, ferric amidosulphonate being as stable in hot solution as the 

 other salts of the acid. But the acid is slowly oxidised, at a boiling 

 heat, by silver oxide and alkali, and then silvers the glass. This 

 oxidation gives the solution the power, when acidified, of reducing 

 small quantities of permanganic acid. This property, together with the 

 fact of sulphites in alkaline solution not being oxidisable by silver 

 oxide, makes it pretty certain that the reduction of silver goes on thus 

 (but see the account of the silver salt, p. 239) : — - 



H,NS0 3 K + Ag 2 = AgS0 8 K + Ag + N + OH 2 . 



Platinum black very slowly acts upon a solution of amidosulphonic 

 ;uid, exposed to the air, and produces sulphuric acid, but, apparently, 

 only by hydrolysis. 



Amidosulphonic acid prevents the precipitation of silver and 

 mercuric salts by alkalis (see the accounts of the silver and oxy mercuric 

 salts, pp. 239 et seq.). Here the acid is seen acting as an amine. 



It combines with boiling alcohol, in the course of hours, and 

 becomes ammonium ethyl sulphate (Krafft and Bourgeois). Boiled 

 with aniline, it is slowly and similarly converted into ammonium 



