2.44 The city of Melbourne, Florida, has a surface

water treatment plant that produces 20 MGD of potable

drinking water. The water source has hardness meas-

ured as 94 mg/Las CaCO3 and after treatment, the hard-

ness is reduced to 85 mg/L as CaCO3. (a) Is the treated

water soft, moderately hard, or hard? (b) Assuming all

the hardness is derived from calcium ion, what would

the concentration of calcium be in the treated water

(mg Ca²+/L). (c) Assuming all the hardness is derived

from magnesium ion, what would the concentration

of magnesium be in the treated water (mg Mg²+/L)?