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diff --git a/2966/CH1/EX1.28/1_28.sce b/2966/CH1/EX1.28/1_28.sce
new file mode 100644
index 000000000..2d4c06119
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+//water//
+//page 1.40 example 12//
+clc    
+Purity_Lime=.7
+Purity_soda=.85
+W1=30.2;//amount of Ca(HCO3)2 in ppm//
+W2=20.8;//amount of Mg(HCO3)2 in ppm//
+W3=28.31;//amount of CaCl2 in ppm//
+W4=8.7;//amount of MgCl2 in ppm//
+W5=35;//amount of CaSO4 in ppm//
+W6=6.7;//amount of MgSO4 in ppm//
+M1=100/162;//multiplication factor of Ca(HCO3)2//
+M2=100/146;//multiplication factor of Mg(HCO3)2//
+M3=100/111;//multiplication factor of CaCl2//
+M4=100/95;//multiplication factor of MgCl2//
+M5=100/136;//multiplication factor of CaSO4//
+M6=100/120;//multiplication factor of MgSO4//
+P1=W1*M1;//in terms of CaCO3//L
+P2=W2*M2;//in terms of CaCO3//2*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//S
+P6=W6*M6;//in terms of CaCO3//L+S
+printf ("We do not take Na2SO4 since it does not react with lime/soda");
+V=100000;//volume of water in litres//
+L=0.74*(P1+2*P2+P4+P6)*V/Purity_Lime;//lime required in mg//
+L=L/10^3;
+printf("\n Amount of Lime required is %.1f g",L);
+S=1.06*(P3+P4+P5+P6)*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