NITRIC ACID ON VARIOUS VEGETABLES. 
417 
It is plain from these determinations that the nitrogen in the acid is to the carbon 
almost exactly in the proportions of 2 to 14 or of 1 to 7? and when calculated 
accordingly, they have given the 
subjoined 
result, 12*23 per cent, nitrogen 
I. 
II. 
C 14 1050*00 
36*84 
36*77 
36*64 
H 4 50*00 
1*75 
1*71 
1*79 
N 2 350*50 
12*30 
12*23 
12*23 
0 14 1400*00 
49*11 
49*29 
49*34 
2850*50 
100*00 
100*00 
100*00 
1 equivalent of nitropopulic acid dried first in the air and then 
Calculated. 
Found. 
in vacuo = 
2850*50: 
= 92*69 
92*79 
2 equivs. water 
225*00 
7*31 
7*21 
3075*50 
100*00 
100*00 
The formula of the acid dried in vacuo, as confirmed by the analysis of the potash 
and silver salts subsequently given, is therefore Cj 4 H 3 Ng O 43 +HO, and the formula 
of the acid dried in the air C 44 H 3 Ng 0 i 3 -l-H 04 - 2 Aq. 
Nitropopulate of Potash. 
One portion of this salt was prepared by digesting crude nitropopulate of potash 
with animal charcoal and repeatedly crystallizing it out of water. The pure salt had 
a lemon-yellow colour and consisted of small prisms. It is very slightly soluble in 
cold water, but exceedingly soluble in alkaline solutions. A second portion of the 
purified salt was crystallized out of a solution which had been rendered slightly 
alkaline by the addition of a few drops of potash. Both portions of the salt were 
dried first in vacuo, and then in the water-bath at 212 ° Fahr., when they lost no 
water. 
Their analysis was conducted as follows; — A weighed portion of each salt was 
gently heated in a covered platinum crucible with a few drops of sulphuric acid, and 
after the mixture of acids had been cautiously volatilized, the heat was considerably 
increased. A little more sulphuric acid was then added, and the excess of the acid 
removed by heating the sulphate with a little carbonate of ammonia. 
I. 0’300 grm. of salt gave 0*0987 KO 803 = 0*0532 potash= 17*73 per cent. 
II. 0*299 grm. of salt gave 0*097 KO 803 = 0*047 KO= 17*42 per cent. 
0*2723 grm. of salt gave 0*317 carbonic acid and 0*029 water. 
Calculated numbers. 
C 14 1050*00 
31*57 
I. 
31*74 
H 3 
37*50 
1*12 
1*17 
N 2 
350*50 
0 13 
KO 
1300*00 
588*00 
17*70 
17*73 
3326*00 
17*42 
