//water and its treatment//
//example 2.18.31//
clc    
Purity_Lime=.80
Purity_soda=.88
W1=84;//amount of MgCO3 in ppm//
W2=25;//amount of SiO2 in ppm//
W3=68;//amount of CaSO4 in ppm//
W4=30;//amount of MgSO4 in ppm//
W5=19;//amount of MgCl2 in ppm//
W6=120;//amount of CaCO3 in ppm//
M1=100/84.004;//multiplication factor of MgCO3//
M3=100/136;//multiplication factor of CaSO4//
M4=100/120;//multiplication factor of MgSO4//
M5=100/95;//multiplication factor of MgCl2//
M6=100/100;//multiplication factor of CaCO3//
P1=W1*M1;//in terms of CaCO3//L
P3=W3*M3;//in terms of CaCO3//S
P4=W4*M4;//in terms of CaCO3//L+S
P5=W5*M5;//in terms of CaCO3//L+S
P6=W6*M6;//in terms of CaCO3//L
printf ("We do not take SiO2 since it does not react with lime/soda");
V=1000000;//volume of water in litres//
L=0.74*(P1*2+P4+P5+P6)*V/Purity_Lime;//lime required in mg//
L=L/10^6;
printf("\nLime required is %.2fkg",L);
S=1.06*(P3+P4+P5)*V/Purity_soda;//soda required in mg//
S=S/10^6;
printf("\nSoda required is %.2fkg",S)