242 W. G@. Leison—Precipitation and Determination 
could be lifted from its seat, and the sand and pee 
—. — into a flask, after careful drying. With this 
Serenger 
0° ich As mahi nitrate required 47°8 c.c. hypermanganate = 
0 $007 gr. desi nitrate required 40°8 ¢.c. hypermanganate = 
‘90 pr. ct. SrO. (100 c.c. ae eS solution con- 
tained 0°1099 gr. available oxygen 
The formula Sr(NO,), requires 48 93 pr. ct. SrO. Sulphuric 
acid only was used to decompose the oxalate. 
Calcium.—Iceland spar was dissolved in chlorhydric acid, 
and the solution treated with oxalic acid and alcohol. The fil- 
trate contained calcium. When, however, the solution was 
evaporated to ess before adding alcohol, and the oxalate 
was washed on a sand filter, no traces of calcium could be de- 
tected in the filtrate. In this manner: 
05090 gr. CaCO, required 70°6 c.c. hypermanganate = 56°10 pr. ct. 
pac (100 c.c. hypermanganate corresponded to 0°11559 gr. 
0°5590 eae CaCO, required 77°5 c.c. hypermanganate = 56°08 pr. ct. 
CaO. (100 ¢.c. hypermanganate corresponded to 0°11495 gr. 
oxygen.) 
The formula requires 56°00 pr. ct. CaO. Sulphuric acid only 
was employed. 
Magnesium. —When magnesic mie. is treated with oxalic 
acid, the mixture evaporated, but not to dryness, and alcohol 
added, ee filtrate is perfectly free from magnesium. In this 
0°3243 gr. +. MgSO +7H,0 required 39°6 c.c. hypermanganate = 
pr. 
0 ase gr. be t Atgo. 7 H,O required 48°4 c.c. hypermanganate = 
Tn say ale the oxalate was collected on a paper filter 
and washed into the flask with water after piercing the filter, 
which was se with cold dilute sulphuric acid. The fo rmula 
requires 16°26 pr. ct. 
inc.—Zine is completely thrown down from its sulphate by 
the iinmanlified rocess. The oxalate forms an extremely fine 
powder. Me sand filter and warm dilute sulphuric acid were 
e 
0°9301 gr. sulphate required 47°1 c.c. hypermanganatee= 28°14 
n 
. 
10788 e. _ sulphate required 54°6 c.c. hypermanganate = 28°15 
Phe 
The pa te requires 28°22 pr. ct. ZnO. 
