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+//Chapter-17,Example 8,Page 371
+clc();
+close();
+
+strength = 10*0.85/9 //strength of EDTA
+
+//1000 ml EDTA solution == 1 g CaCO3
+
+//for 20 ml EDTA solution
+
+amnt= 20*strength/1000
+
+//50 ml smple of water contains amnt CaCO3
+
+hard= amnt*10^6/50 //hardness of water
+
+printf("the hardness of water is = %.2f ppm", hard)