initial commit / add all books

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diff --git a/1478/CH2/EX2.18.21/2_18_21.sce b/1478/CH2/EX2.18.21/2_18_21.sce
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+//water and its treatment//

+//example 2.18.21//

+clc    

+Purity_Lime=.85

+Purity_soda=.95

+W1=55.5;//amount of CaCl2 in ppm//

+W2=20;//amount of SiO2 in ppm//

+W3=12.6;//amount of  NaHCO3 in ppm//

+W4=250;//amount of KCl in ppm//

+W5=48;//amount of MgSO4 in ppm//

+W6=2.2;//amount of CO2 in ppm//

+W7=43.8;//amount of Mg(HCO3)2 in ppm//

+W8=2;//amount of Fe++ in ppm//

+W9=10;//amount of AlCl3 in ppm//

+M1=100/111;//multiplication factor of CaCl2//

+M3=100/(84*2);//multiplication factor of NaHCO3//

+M5=100/120;//multiplication factor of MgSO4//

+M6=100/44;//multiplication factor of CO2//

+M7=100/146;//multiplication factor of Mg(HCO3)2//

+M8=100/55.8;//multiplication factor of Fe++//

+M9=100/133.42;//multiplication factor of AlCl3//

+P1=W1*M1;//in terms of CaCO3//L

+P3=W3*M3;//in terms of CaCO3//+L and -S 

+P5=W5*M5;//in terms of CaCO3//L+S

+P6=W6*M6;//in terms of CaCO3//L

+P7=W7*M7;//in terms of CaCO3//L

+P8=W8*M8;//in terms of CaCO3//L+S

+P9=W9*M9;//in terms of CaCO3//L+S

+printf ("We do not take SiO2 and KCl since they do not react with lime/soda");

+V=50000;//volume of water in litres//

+L=0.74*(P3+P5+P6+P7*2+P8+P9)*V/Purity_Lime;//lime required in mg//

+L=L/10^6;

+printf("\nLime required is %.3fkg",L);

+S=1.06*(P1-P3+P5+P8+P9)*V/Purity_soda;//soda required in mg//

+S=S/10^6;

+printf("\nSoda required is %.4fkg",S)