182 Johnson and Chittenden—New Acid Ammonium Sulphaies. 
first analysis 68°95 per cent and after a second ignition 69°41 
per cent To make the analyses more complete, ammonia 
was estimated in both samples by distillation with sodium hy- 
droxide, and in the second sample hydrogen was determined by 
combustion with lead chromate and metallic copper and found 
to be 4°67 per cent. 
the basis of the ammonia estimation we have the follow- 
ing statement. 
Found. Found. Calculated for 
z 2. pisulphate. 
SO 70°08 69°41 69°56 
NH, 17°00 17°08 14°78 
Difference 12°92 13°51 H,O 15°66 
100°00 100°00 100°00 
The ultimate composition, reckoning oxygen by difference, 
is—— 
Found. Found. Calculated for 
i: 2. bisulphate. 
Ss 28°01 27°76 Ziec 
oO 53°49 55°65 
N 14°01 14°08 1217 
H 4°34 
100°00 99°98 
On dissolving in water the solution has an acid reaction, 
addition of strong alcohol to the saturated solution throws 
down a crystalline precipitate which is normal ammonium sul- 
phate and yielded in the results of two successive determinations 
25 r cent and 25°65 per cent of 3. Theory requires 
The analyzed substance compared with the salts just named 
in respect to atomic ratios gives the following results, eight 
atoms of sulphur being assumed in each case for convenience. 
Normal 
Seweitzer’s 1st 
sulphate. Bisulphate. Pyrosulphate. substance. 
oe 8 8 
N=16 8 12 9°3 
H=s4 40 26 43 
O==32 32 24 30°8 
Inspection of the above figures makes evident that the ana- 
lyzed substance must contain besides normal sulphate, a cer- 
