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+//water//
+//page 1.59 example 1//
+clc
+volume_water=10^4//in litres//
+volume_HCl=200//in litres//
+conc_HCl=0.1//in Normals//
+totl_hardness=volume_HCl*conc_HCl*50//in terms of g CaCO3 equivalent//
+h=totl_hardness/volume_water//in terms of g CaCO3 equivalent//
+printf("\nHardness of water sample is %.f mg/L",h*1000); \ No newline at end of file