Composition of Alkali Salts 279 



Table showing composition of alkali salts 



Acids and bases California Washington Montana 



Silica (SiO 2 ) 1.663 1.552 .42 



Potash (K 2 O) 3.602 9.588 1.774 



Soda(Na 2 O) 40.058 45.387 30.442 



Lime(CaO). 519 .048 1.464 



Magnesia (MgO) 258 .115 5.956 



Peroxide of iron (Fe 2 O :{ ) an I alu- 

 mina (A1 2 O 3 ) ..I 079 .028 .04 



Phosphoric acid (P 2 O 5 ) 1.457 .81 .012 



Sulphuric acid (SO 3 ) 18.946 2.12 44.482 



Nitric acid (N 2 O 5 ) 1.923 .000 1.074 



Carbonic acid (CO 2 ) 13.982 34.058 2.208 



Chlorine (Cl) 7.46 1.077 5.148 



Ammonia (NH 3 ) .047 .000 .000 



Organic matter and water of crystalli- 

 zation 11.282 5.073 



101.276 99.856 101.156 

 Less excess of oxygen corresponding 



to Cl 1.623 .238 1.166 



Totals 99.653 99.618 99.990 



When these results are computed as salts they 

 stand, according to Hilgard, as expressed below: 



Table showing composition of soluble portions of alkali salts 



California Washington Montana 



Potassium Sulphate (K 2 SO 4 ) 6.796 3.715 3.774 



carbonate (K 2 CO 3 ) ... .732 12.378 .000 



Sodium sulphate (Na 2 SO 4 ) 31.956 .000 61.432 



" nitrate (NaNO 3 ) 3.64 .000 1.878 



" carbonate (Na 2 CO 3 ) 39.413 80.053 2.94 



chloride (NaCl) 14.703 1,913 9.864 



" phosphate (HNa 2 PO 4 ) 2.273 1.943 .000 



Magnesium sulphate (MgSO 4 ) 307 .000 21 .12 



Ammonium carbonate (NH 42 CO 3 )-.. .157 .000 .000 



