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diff --git a/2966/CH1/EX1.40/1_40.sce b/2966/CH1/EX1.40/1_40.sce
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+//water//
+//page 1.52 example 5//
+clc
+volume_hardwater=100000//in litres//
+volume_NaCl=400//Volume of NaCl in litres//
+conc_NaCl=100//% NaCl consumed by zeolite bed//
+Wt_per_Litre=conc_NaCl*10//gms NaCl consumed by zeolite bed per litre//
+total_wt=Wt_per_Litre*volume_NaCl//total gms NaCl consumed by zeolite bed//
+CaCO3_equivalent=total_wt*50/58.5//in terms of (gms/lit)//
+H=CaCO3_equivalent/volume_hardwater//Hardness of water(gms/lit)//
+Hardness=H*100//Hardness of water(mg/lit) or ppm//
+printf("\nHardness of water sample is %.1f mg/L",Hardness);
+\ No newline at end of file