Answer to Question #293347 in Chemical Engineering for nikki

Question

0.75 gm of calcium carbonate is dissolved in 1 liter of distilled water. 100 ml of this

standard hard water requires 25 ml of EDTA solution. 100 ml of unknown hard water requires 15 ml of EDTA solution. 100 ml of same water sample after boiling requires 10 ml of EDTA solution. Calculate Total, Permanent and Temporary hardness of water sample.

Answer 1

0.75 gm of calcium carbonate is dissolved in 1 liter of distilled water. 100 ml of this standard hard water requires 25 ml of EDTA solution

100 ml of this standard hard water requires 25 ml of EDTA solution. 100 ml of unknown hard water requires 15 ml of EDTA solution. 100 ml of same water sample after boiling requires 10 ml of EDTA solution.

Total hardness = Permanent hardness + Temporary Hardness

Temporary Hardness is removed after boiling.