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diff --git a/1478/CH2/EX2.18.39/2_18_39.sce b/1478/CH2/EX2.18.39/2_18_39.sce
new file mode 100755
index 000000000..3845af876
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+++ b/1478/CH2/EX2.18.39/2_18_39.sce
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+//water and its treatment//
+//example 2.18.39//
+clc    
+Purity_Lime=.90
+Purity_soda=1
+W1=136;//amount of CaSO4 in ppm//
+W2=49;//amount of H2SO4 in ppm//
+W3=95;//amount of MgCl2 in ppm//
+W4=60;//amount of MgSO4 in ppm//
+W5=50;//amount of SiO2 in ppm//
+M1=100/136;//multiplication factor of CaSO4//
+M2=100/98;//multiplication factor of H2SO4//
+M3=100/95;//multiplication factor of MgCl2//
+M4=100/120//multiplication factor of MgSO4//
+P1=W1*M1;//in terms of CaCO3//S
+P2=W2*M2;//in terms of CaCO3//L+S 
+P3=W3*M3;//in terms of CaCO3//S
+P4=W4*M4;//in terms of CaCO3//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*(P2)*V/Purity_Lime;//lime required in mg//
+L=L/10^6;
+printf("\nQuantity of Lime required is %.2fkg",L);
+S=1.06*(P1+P3+P4)*V/Purity_soda;//soda required in mg//
+S=S/10^6;
+printf("\nQuantity of Soda required is %.0fkg",S)
+\ No newline at end of file