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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)
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