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+//calculating lime and soda
+//Example 1.9
+clc
+clear
+//For raw water Ca+2,
+q1=160//quantity
+wt1=40//molecular weight 
+M1=100/wt1//multiplication factor
+Eq1=M1*q1//CaCO3 equivalents in mg/L
+//For Mg+2,
+q2=96//quantity
+wt2=24//molecular weight 
+M2=100/wt2//multiplication factor
+Eq2=M2*q2//CaCO3 equivalents in mg/L
+//For CO2,
+q3=34//quantity
+wt3=44//molecular weight 
+M3=100/wt3//multiplication factor
+Eq3=M3*q3//CaCO3 equivalents in mg/L
+//For HCO3-,
+q4=403//quantity
+wt4=122//molecular weight 
+M4=100/wt4//multiplication factor
+Eq4=M4*q4//CaCO3 equivalents in mg/L
+//For NaAlO2,
+q5=20//quantity
+wt5=82*2//molecular weight 
+M5=100/wt5//multiplication factor
+Eq5=M5*q5//CaCO3 equivalents in mg/L
+V=300000//Volume of water in litres
+L=(74*(Eq2+Eq3+Eq4-Eq5)/100)*(V/1000000)//lime requirement in kg
+S=(106*(Eq1+Eq2-Eq4)/100)*(V/1000000)//soda requirement in kg
+printf('Thus amount of lime required to soften 250000 litres of water = %3.1f kg\n',L)
+printf('and amount of soda required to soften 250000 litres of water = %3.1f kg\n',S)