DATABASE C:\Program Files\USGS\Phreeqc Interactive 2.6\wateq4f.dat
# R.1. Exercise
SOLUTION_SPREAD
 Description	 Temp	  pH	       O(0)	    Ca	    Mg	    Na	     K	    Cl	 S(6)	        C(4)	  N(5)	 N(-3)
           	     	    	 O2(g) -0.7	      	      	      	      	      	     	 CO2(g) -3.5	      	      
   Rainwater	   25	 4.5	          1	 0.384	 0.043	 0.141	 0.036	 0.236	  1.3	           1	 0.237	 0.208
END
MIX 1
    1    1
END