T.E.P.P. (Tetraethyl pyrophosphate) 
T.E.P.P. is soluble in water. At concentrations normally employed, 
hydrolysis is of the first order provided pH is constant or on the acid 
side, 
Bom eg ei 
k= ; log.—_, = 

log = 
t 10 a-x 
Since hydrolysis is not appreciably catalysed by hydrogen ions, at 25°C, 
k reduces to: 
ic=60(0H—] + 126) x07 min. 
For convenience, the rate of hydrolysis in terms of the time for 504 
decomposition is expressed: 
9 
tine = ps 
k oat Se 

300 
