EXERCISE I 



ARRANGING LABORATORY APPARATUS PREPARATORY 



FOR USE 



Mix potassium bichromate K 2 Cr 2 7 and sulphuric 

 acid H 2 S0 4 in equal parts in eight to twelve of 

 water for a cleaning mixture. Clean all glassware 

 with this mixture by allowing the articles to stand 



FIG. 1. Bottle washing machine and sanitary wash tank, 

 showing trap connections. This prevents water from 

 splashing on the floor and soiling clothes or disfiguring 

 machinery. The horizontal pipe should be six inches lower 

 for convenience in stepping over it. 



submerged in it for at least twenty minutes. Re- 

 move them from the cleaning mixture, wash with 

 a solution of warm water and good washing powder, 



1 



