394 W.J. Craw on the Determination of Phosphoric Acid. 
salt. ‘I'he presence of molybdic acid is not injurious, as the 
particularly tested. 
The yellow powder is found to be 
In chlorid of ammonium, - - easily soluble. 
Oxalate of ammonia, - - w, is 
Sulphate . - - sparingly “ 
itrate of potash, - - : : 
Chlorid of potassinm, - - “sp . 
Sulphate of magnesia, —- - ¢ a 
itrate of ammonia, - - very little “ 
Sulphate of potash, - - -.._. soluble. 
Sulphate of soda, - - nie aen 
Chlorid of sodium, - - : s 
Chlorid of magnesium, -.~— - . 
Sulphuric acid, strong and dilute, . is 
Hydrochloric ~. « és 4 
itric on se “ 
Hot, water;.. <.KCmeN i= “ u“ 
In all these cases the mixtnre was heated to boiling. Solu- 
tions of the caustic alkalies and the alkaline carbonates and phos- 
_ phates dissolve the yellow componnd even in the cold. So also 
» chlorid of ammonium and oxalate of ammonia. The mineral 
acids also act upon it to some extent. Cold water dissolves It 
with great difficulty. It appears to be decomposed, to a small 
extent, by the eombined influence of air aud moisture, as it turns 
blue when dried in the atmosphere after washing with water. 
Its behavior towards solvents is changed by the presence of mo- 
lybdate of ammonia, so that it becomes nearly insoluble in acids, 
even on boiling. The act of solution is, probably, in all cases, 
attended with decomposition and removal of molybdic acid, 
which is prevented by the presence of molybdate of ammonia. 
Some quantitative experiments were also made on the separa 
tion of phosphoric acid from the bases. It may be important to 
remark, that, when effecting the precipitation by means of mo- 
