MIXED COMPOUNDS 8 1 



(2) (a) Examine samples of 



Potassium acid tartrate (Cream of tartar), 

 Potassium sodium tartrate (Rochelle salt), 

 Potassium antimonyl tartrate (Tartar emetic). 



(b) Mix about 5 g. each of potassium acid tartrate and sodium acid 

 carbonate, NaHCOs. Add 10 c.c. water and warm slightly. What 

 gas is given off ? This mixture is the basis of most baking powders. 



G 



