ieee AI rat ies th aii ite Skane ae e= 
Potassium as an Oxydizing mixture. 205 
The strengths of the various solutions employed as solvents 
were as follows :— 
Ammonia-water, strong = ordinary liquor ammoniz. 
Ammonia-water, weak = a mixture of 1 volume of the strong am- 
monia-water with 3 vols. of water. 
Nitric acid, dilute = a mixture of 1 volume of the strong acid 
9° B.), with 5 vols. water. 
Chlorhydric acid, dilute = 1 vol. of the ordinary concentrated 
cid with 4 vols. water. 
Acetic acid = 1 vol. of the commercial acid mixed with 1 vol. 
of water. 
Chlorid of ammonium = 1 part of the crystallized salt in 10 parts 
of water. 
Nitrate of ammonium = 1 part of the crystallized salt in 10 parts 
of water. 
Acetate of ammonium = ammonia-water dilute, neutralized with 
the acetic acid of the given strength. 
Acetate of sodium was made by saturating a quantity of commer- 
cial acetic acid with carbonate o ium and diluting the 
liquid with 4 volumes of water. é 
ee of copper was prepared according to the directions of 
tolba.* 
gar = 1 part of sugar in 10 parts of water. 
Glucose (starch sugar)—=1 part of sugar in 10 parts of water. 
In no instance 
did the starch become blue on the addition of the ek i 
ough nothing but water was used for washing the latter. 
But a blue coloration was immediately produced, whenever a 
* Zeitschrift analyt. Chem., ii, 390. 
