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diff --git a/615/CH7/EX7.11/7_11.sce b/615/CH7/EX7.11/7_11.sce
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+//water chemistry//
+//example 7.11//
+P=0;//phenolplthalein alkalinity in water sample//
+V=16.9;//required HCl in ml for 100 ml water sample//
+N=0.02;//normality of HCl//
+printf("Since P=0 the alkalinity is due to HCO3- ions");
+C=50;//equivalent of CaCO3 in mg for 1 ml 1N of HCl//
+A=C*V*N;
+printf("\nIn 100ml water sample the alkalinity is %fmg",A);
+B=A*1000/100;
+printf("\nFor 1 litre of water the alkalinity is %fmg/l",B);
+\ No newline at end of file