AMMONIA. 



217 



and set the gas at liberty. Potash or lime may be 

 used for this purpose. Introduce into a test- 

 tube about half an inch of a stick of fused potash, 

 and covered it with powdered sal-ammoniac. 

 On the addition of water to dissolve them, am- 

 monia will be immediately evolved. Rest the 

 tube on the table, and place a wide-mouthed 

 vial over it to collect the gas. 



540. SOLUTION IN WATER. AQUA AMVIO- 



How is its so- 

 lubility in wa- NIA. Bring the mouth of the vial filled with 

 ter proved? ammoniacal gas, quickly, into a bowl of 

 water. The water will swallow up the gas so rapidly as 

 to rise and fill the vial, producing a weak solution of 

 ammonia, or hartshorn. If only a small portion of 

 water be allowed to enter, and the vial be then re- 

 moved from the bowl and shaken, the hartshorn ob- 

 tained will be comparatively strong. For the prepira- 

 tion of the solution in large quantity, the method given 

 in the section on Chlorine is to be preferred. The 

 vial should be previously warmed. Newly slaked lime 

 may be substituted for potash. 



How ma,, the 54L A MINIATURE FOUNTAIN. Fill a 



ammonia be pi n t v ial with ammonia, by 



employed to 



produce a jet the method above given, and 

 of water ? immediately introduce, air- 

 tight, into its mouth, a moist paper 

 stopper, with a bit of pipe-stem run 

 through it. Then invert the bottle into 



O 



a bowl of water. The absorption by 

 the first portions of water that enter will be so com- 



10 



