SILVER OXALATE. 475 



elements, may be calculated, granting the formation of this 



ether from the acid and alcohol, both dilute. 



CH 4 (dilute) + C10 4 H (dilute) = CH 2 (C10 4 H) (dilute) + H 2 



absorbs - 2'0 CaL, 



a value found in general for organic oxacid ethers, and even for 

 nitric ether itself. 

 We further have 



C + H 4 + + water = CH 4 (dissolved) 



Cl + 4 + H + water = C10 4 H (dilute) 



Reaction ... 



66-9 



Supposing the solution of the ether in the water to have 

 liberated + 2*0, the formation of the pure ether then corresponds 

 to + 65 Cal. 



Now, the formation of H 2 produces + 69 - 0. We finally 

 obtain 



C + H 3 + 4 + Cl = CH 2 (C10 4 H) (dilute) - 4-0 Cal., 

 approximately. 



5. The explosive decomposition will liberate 1 + 175 Cal. 

 (gaseous water) ; or, for 1 kgm., + 1529 Cal. 

 , 6. It will produce 781 litres, or, for 1 kgm., 682 litres. 



7. The permanent pressure would be calculated from this 

 figure if reaction did not take place between water and the 

 acid during cooling (see note). 



rm. i* 1 i 7730 atm - 



8. Theoretical pressure = 



n 



9. From these numbers the heat liberated is nearly that of 

 nitroglycerin (1480 Cal. for 1 kgm. and gaseous water). The 

 gaseous volume is also nearly the same. 



It is therefore easy to understand that the theoretical 

 pressure must also be nearly the same as that of nitroglycerin. 

 We should have a still more powerful effect by mixing 3 

 equiv. of methylperchloric ether with 1 equiv. of ethylperchloric 

 ether, so as to obtain an exact combustion of both ethers. On 

 the whole, the explosive properties of the perchloric ethers 

 correspond to those of nitroglycerin and the most powerful 

 substances. It is this that has led the author to mention here 

 this class of compounds. 



11. SILVER OXALATE. 



1. It has been shown (p. 366) that this compound is explosive, 

 and explodes by shock, or heating, towards 130. It is even a 

 shattering body. 



1 HC1 and H 2 being supposed separated from each other in the gaseous 

 state. In reality there will be a partial reaction during cooling with formation 

 of hydrate and corresponding liberation of heat. 



