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diff --git a/1478/CH2/EX2.18.12/2_18_12.sce b/1478/CH2/EX2.18.12/2_18_12.sce
new file mode 100755
index 000000000..165f95a95
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+++ b/1478/CH2/EX2.18.12/2_18_12.sce
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+//water and its treatment//
+//example 2.18.12//
+clc
+strength_CaCl2=250/200//in terms of mgs/ml CaCO3//
+volume_CaCl2=25//volume of CaCl2 titrated(ml)//
+EDTA_CaCl2=35//volume in terms of ml//
+volume_hardwater=25//volume of hardwater titrated(ml)//
+EDTA_hardwater=30//volume used to titrate unknown hardwater//
+CaCO3_equivalent_CaCl2=strength_CaCl2*volume_CaCl2//in terms of mg//
+one_ml_EDTA=CaCO3_equivalent_CaCl2/EDTA_CaCl2//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 %.0f mg/l or ppm",Hardness);
+\ No newline at end of file