SALIVARY DIGESTION 6 1 



the ingestion of the potassium iodide and the appearance of the first traces of the 

 substance in the saliva. If convenient, the urine may also be tested. The 

 chemical reactions taking place in this experiment are indicated hi the following 

 equations : 



(a) 2NaN0 2 +H 2 S0 4 ^2HN0 2 +Na 2 S0 4 . 



(*) 2KI+H 2 S0 4 -2HI+K 2 S0 4 . 



(c) 2 HN0 2 + 2HI->I 2 + 2 H 2 0+2NO. 



