Question

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6. a. Determine the number of moles of hardening ions present in a 100-mL, volume sample that has a hardhess 58 ppm CaCO,. See equations 21.6 and 21.7. b. What volume of 0,100 M Na,/H,Y is needed to reach the Eriochrome Black T endpoint for the analysis of the sole tion. See equation 21.5. e. Water hardness is also commonly expressed in units of grains/gallon, where I grain/gallon equals 17.I p Express the hardness of this "slightly hard" water sample in grains/gallon.

Answer 1

6a Hord nes (0 53 X100 x 1o moles oo g mo molar moss o (alos ndening n 5.8 105 L C) 4a 58 por lat0s 58 gen ele 11.1 3.292 atan gallon