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diff --git a/2966/CH1/EX1.9/1_9.sce b/2966/CH1/EX1.9/1_9.sce
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+//water//
+//page 1.15 example 1//
+clc
+strength=1.1//in terms of mgs/ml CaCO3//
+volume=50//volume titrated(ml)//
+EDTA=38//volume in terms of ml//
+volume_hardwater=100//volume of hardwater titrated(ml)//
+EDTA_hardwater=21//volume used to titrate unknown hardwater//
+CaCO3_equivalent=strength*volume//in terms of mg//
+one_ml_EDTA=CaCO3_equivalent/EDTA//in terms of CaCO3 equivalent//
+titrate_equivalent=one_ml_EDTA*EDTA_hardwater/volume_hardwater//CaCO3 equivalent of titrated volume//
+Hardness=titrate_equivalent*1000//in terms of mg/lit or ppm//
+printf("\nHardness of water is %.1f mg/L",Hardness);
+\ No newline at end of file