A sample of water has its hardness due to only `CaSO_(4)`. When this water is passed through on anion exchange resin, `SO_(4)^(2-)` ions are replaced by `OH^(-)`. A `25.0 mL` sample of water so treated requires `21.58 mL` of `10^(-3) MH_(2)SO_(4)` for its titration. What is the hardness of water expressed in terms of `CaCO_(3)` in ppm? Assume density of water `1.0g//mL`.

Answer

`86 "ppm"`;