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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)