44 The Philippine Journal of Science 



suits of analyses and observations on the seasonal variation of 

 the physical and chemical properties of the waters will be the 

 subject of another paper, to be submitted, in the form of a 

 report, to the manager of the Metropolitan Water District, m 

 the latter part of the present year. 



STATEMENT OF ANALYTICAL RESULTS 



The statement of water analyses that is now almost univer- 

 sally adopted is the ionic form. This form, however, is not per 

 se sufficient to permit one to judge the chemical character of 

 a water. For this purpose the reacting value of each individual 

 radicle for a given analysis must be determined. 



Stabler defines the reacting value x of a radicle as the product 

 obtained by multiplying the quantity of that radicle, expressed 

 in parts per million, by its reaction coefficient. The reaction 

 coefficient, on the other hand, is the capacity of a unit weight 

 of the radicle to enter into chemical reaction. Hence, if 

 V = capacity for reaction or valence, 

 W = atomic or molecular weight of radicle, 

 M = quantity of the radicle in parts per million, 

 then, 



Reacting value = ■ ^ — • 



The value w is the reaction coefficient. 



The different values of the radicles are thus resolved into 

 quantities that are chemically measurable by a common standard ; 

 namely, hydrogen (H), which is the universally accepted 

 standard of reaction. 



REACTING VALUES ( 



If the different reacting values obtained according to the 

 above formula are expressed in percentages of the concentration 

 value, the peculiar characteristics of a water due to its mineral- 

 ization will be very much in evidence. Such expressions form 

 the character formula of a water, by means of which it is 

 possible to establish its relation with the general geology of the 

 country. The character formula, or the reacting values, may 



