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diff --git a/1427/CH1/EX1.15/1_15.sce b/1427/CH1/EX1.15/1_15.sce
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+//ques-1.15
+//Calculating hardness of water sample
+clc
+V=100;//volume of water (in mL)
+v1=25;//volume of Sodium carbonate added (in mL)
+v2=10;//volume of Sulphuric acid required (in mL)
+N=1/50;//normality of Sodium carbonate and Sulphuric acid
+h=(v1-v2)*N*(1000/V)*50;//hardness
+printf("The hardness is permanent with value %d ppm.",h);