70 HYrONITRITES ; PEOPEKTIES AND PREPARATION BY 



to show the reactions of a hyponitrite with silver, mercuric, 

 mercurous, copper, lead, and other salts. 



Calcium, strontium, and barium hyponitroso-acetates. 



Some remarkable salts have been described by Maqiieune, 

 having the composition expressed by the formulae — 



Ca NA, Csi{C,Bß,%, (CoHA)2, (OH^),; 

 Sr NA, Sr ^0^0^)2, (C.HA)^, (0H.)3 ; 

 Ba N,02, Ba(C,H302)2, (CoH.O.),, (OH^. 



I have prepared and partly analysed the calcium salt, following 

 Maquenne's process, which is to dissolve calcium hyponitrite in 

 30 per cent, acetic acid until the new salt begins to crystallise 

 out. I kept the acid at about 50° while dissolving in it nearly 

 as much of the calcium salt as it would take up, and then by 

 cooling got the salt. It is remarkable that this can be done 

 without causing more than very slight effervescence. The salt 

 crystallises in short prisms, stable for many days, very soluble 

 in water, in which it gives with silver nitrate the yellow hypo- 

 nitrite. In spite of its acid composition it is neutral or even 

 slightly alkaline to litmus. To account for its existence and 

 neutral reaction I suggest for it the constitution expressed by 

 the formula — 



Ca(OÄc), Ca:^^|T^,OAc^ ^^^^^^ 



This represents it as being normal calcium acetate with one 

 fourth of its oxylic oxygen replaced by the hyponitrite radical, 

 or as a double anhydride of calcium acetate and hyponitrite. 

 It thus is made out to have a constitution analogous to that of 



