A NEW CLASS OF SALTS. 
507 
Analysis X. Silver salt prepared from sodium salt (No. 4) containing 2 r59 carbon, 
or in which the sodium was to the carbon as I : 5^. In order if possible to remove 
the excess of iron, the salt was first precipitated by sulphate of copper and washed, 
the copper salt was now decomposed by soda and crystallized, and the silver salt was 
precipitated from this newly-crystallized portion. 
I. 19*605 grs. gave 3’77 gTS. peroxide of iron and 12‘86 grs. chloride of silver. 
II. 1 6*795 grs. gave 3*24 grs. peroxide of iron and 1 0*94 grs. chloride of silver. 
III. ] 3*580 grs. gave 2*60 grs. peroxide of iron and 8*79 grs. chloride of silver. 
IV. 6*765 grs. gave 1*35 gr. peroxide of iron and 4*355 grs. chloride of silver. 
V. 14*68 grs. gave 2*80 grs. peroxide of iron and 9*44 grs. chloride of silver. 
r VI. 13*16 grs. gave 2*43 grs. peroxide of iron and 8*535 grs. chloride of silver. 
^ VII. 24*41 grs. gave 4*54 grs. peroxide of iron and 15*79 grs. chloride of silver. 
VIII. 15*21 grs. gave 2*88 grs. peroxide of iron and 9*89 grs. chloride of silver. 
IX. 13*60 grs. gave 2*60 grs. peroxide of iron and 8*80 grs. chloride of silver. 
X. 8*81 grs. gave 1*69 gr. peroxide of iron and 5*59 grs. chloride of silver. 
The combustions were made partly with chromate of lead, partly with oxide of 
copper. 
I. 12*05 grs. gave 6*08 grs. carbonic acid and 0*10 gr. water. 
II. 12*195 grs. gave 6*10 grs. carbonic acid and 0*08 gr. water. 
IV. 8*10 grs. gave 4*03 grs. carbonic acid and 0*09 gr. water. 
V. 10*35 grs. gave 5*13 grs. carbonic acid and 0*21 gr. water. 
VI. 14*52 grs. gave 7T8 grs. carbonic acid and 0*05 gr. water. 
VIII. 9*56 grs. gave 4*85 grs. carbonic acid and 0*04 gr. water. 
IX. 10*835 grs. gave 5*50 grs. carbonic acid and 0*10 gr. water. 
( 
I. 
A 
II. 
1 
III. 
IV. 
V. 
( 
VI. 
A 
VII. ^ 
VIII. 
IX. 
X. 
Mean. 
Iron 
13-46 
13-50 
13-40 
13-97 
13-35 
12-92 
13-01 
13-25 
13-38 
13-42 
13-36 
Silver 
. 49-42 
49-02 
48-71 
48-46 
49-50 
48-67 
48-69 
48-93 
48-70 
47-77 
48-78 
Carbon 
. 13-75 
13-64 
13-56 
13-43 
13-48 
13-82 
13-84 
13-64 
Hydrogen 
0-09 
0-07 
0-12 
0-22 
0-03 
0-04 
0-10 
0-09 
Nitrogen "I 
Oxygen / 
23-28 
23-77 
23-89 
23-50 
24-90 
23-96 
23-98 
24-13 
100-00 
100-00 
100-00 
100-00 
100-00 
lOO-OO 
100-00 
100-00 
If we assume the mean iron, 13*36, to represent the true quantity, then the silver to 
correspond to it in atomic proportion should have been 51*53, whereas there is only 
48*78. Hence there is 0*72 of iron in excess over the equivalent quantity ; this excess 
corresponds to ^th of an equivalent. Again, supposing the carbon to be in the same 
proportion to the silver as in the nitroprussides, there should have been 13*0, so that 
there is an excess of 0*64. The excess of iron and of carbon is therefore almost 
exactly as 1 equiv. : 4 equivs., or viewing the carbon as representing cyanogen as 1:2. 
On this view the amount of impurity in the silver salt is 2*10 per cent. Calculating 
the mean analysis deprived of this supposed impurity, we have 
