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diff --git a/1478/CH2/EX2.18.26/2_18_26.sce b/1478/CH2/EX2.18.26/2_18_26.sce
new file mode 100755
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+//water and its treatment//
+//example 2.18.26//
+clc    
+Purity_Lime=.89
+Purity_soda=.92
+W1=30;//amount of CaCO3 in ppm//
+W2=90;//amount of MgCO3 in ppm//
+W3=160;//amount of MgCl2 in ppm//
+W4=35;//amount of MgSO4 in ppm//
+W5=25;//amount of CaSO4 in ppm//
+W6=120;//amount of NaCl in ppm//
+M1=100/100;//multiplication factor of CaCO3//
+M2=100/84.01;//multiplication factor of MgCO3//
+M3=100/95;//multiplication factor of MgCl2//
+M4=100/120;//multiplication factor of MgSO4//
+M5=100/135.9;//multiplication factor of CaSO4//
+P1=W1*M1;//in terms of CaCO3//L
+P2=W2*M2;//in terms of CaCO3//L
+P3=W3*M3;//in terms of CaCO3//L+S
+P4=W4*M4;//in terms of CaCO3//L+S
+P5=W5*M5;//in terms of CaCO3//S
+printf ("We do not take NaCl since it does not react with lime/soda");
+V=40000;//volume of water in litres//
+L=0.74*(P1+P2*2+P3+P4)*V/Purity_Lime;//lime required in mg//
+L=L/10^6;
+printf("\nQuantity of Lime required is %.3fkg",L);
+S=1.06*(P3+P4+P5)*V/Purity_soda;//soda required in mg//
+S=S/10^6;
+printf("\nQuantity of Soda required is %.3fkg",S)
+\ No newline at end of file