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diff --git a/2966/CH1/EX1.23/Ex1_23.sce b/2966/CH1/EX1.23/Ex1_23.sce
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+//water//
+//page 1.36 example 7//
+clc    
+Purity_Lime=1
+Purity_soda=1
+W1=10;//amount of CaCO3 in ppm//
+W2=36.5;//amount of Mg(HCO3)2 in ppm//
+W3=19;//amount of MgCl2 in ppm//
+M1=100/100;//multiplication factor of CaCO3//
+M2=100/146;//multiplication factor of Mg(HCO3)2//
+M3=100/95;//multiplication factor of MgCl2//
+P1=W1*M1;//in terms of CaCO3//L
+P2=W2*M2;//in terms of CaCO3//2*L
+P3=W3*M3;//in terms of CaCO3//L+S
+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*P2+P3)*V/Purity_Lime;//lime required in mg//
+L=L/10^3;
+printf("\n Amount of Lime required is %.f g",L);
+S=1.06*(P3)*V/Purity_soda;//soda required in mg//
+S=S/10^3;
+printf("\n Amount of Soda required is %.f g",S)
+\ No newline at end of file