Answer to Question #176874 in Inorganic Chemistry for angelica villalon

Question

6. A standard CaCO3 solution is prepared by dissolving 0.4193g in enough dilute HCl to effect solution and then diluted to 500ml solution. A 25.00ml aliquot requires 23.62ml EDTA solution for titration. A 25.00ml water sample determined for total hardness, requires 8.45ml of the EDTA solution using Eirochrome Black T indicator. Calculate the total hardness in the water sample expressed in ppm CaCO3. * *

Answer 1

$X= \frac {0.05 ×1 ×1000} {25} = 2.$