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diff --git a/1478/CH2/EX2.18.45/2_18_45.sce b/1478/CH2/EX2.18.45/2_18_45.sce
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+++ b/1478/CH2/EX2.18.45/2_18_45.sce
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+//water and its treatment//
+//example 2.18.45//
+clc
+Hardness=250//Hardness of water(mg/lit) or ppm//
+H=Hardness/1000//Hardness of water(gms/lit)//
+volume_NaCl=50//Volume of NaCl//
+conc_NaCl=15//% 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)//
+volume_hardwater=CaCO3_equivalent/H
+printf("\nCaCO3 equivalent is %.f mgs",CaCO3_equivalent*1000);
+printf("\nQuantity of water softened using zeolite bed is %.f litres",volume_hardwater);
+\ No newline at end of file