Chapter 21, Problem 67IAE

A particular water sample contains 56.9 ppm ${\text{SO}}_{\text{4}}{}^{\text{2-}}$ and 176 ppm ${\text{HCO}}_{\text{3}}{}^{\text{-}}$ , with ${\text{Ca}}^{\text{2+}}$ as the only cation.

1. How many parts per million of ${\text{Ca}}^{\text{2+}}$ does the water contain?
2. How many grams of CaO are consumed in removing ${\text{HCO}}_{\text{3}}{}^{\text{-}}$, from 602 Kg of the water?
3. Show that the ${\text{Ca}}^{\text{2+}}$ remaining in the water after the treatment described in part (b) can be removed by adding ${\text{Na}}_{\text{2}}{\text{CO}}_{\text{2}}$ .
4. How many gram of ${\text{Na}}_{\text{2}}{\text{CO}}_{\text{2}}$ are required for the precipitation referred to in part (c)?