In determination of hardness by EDTA method, 50ml of standard hard water required 30ml of EDTA solution while 50ml of sample hard water consumed 20ml of EDTA solution. After boiling 50ml of same sample required 10ml of EDTA solution. Calculate the permanent hardness.

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Water topics include: Sources of water, impurites and hardness of water, hardness estimation, lime washing soda method, permutits and ion exchange process, water pollutants types, water pollution methods, biological oxidation process, reverse osmosis, cod and bod, problems and formulas, water pollution control and monitoring. Water is an inorganic compound with the chemical formula H 2O. It is a transparent, tasteless, odorless, and nearly colorless chemical substance, and it is the main constituent of Earth's hydrosphere and the fluids of all known living organisms (in which it acts as a... Show more

In determination of hardness by EDTA method, 50ml of standard hard water required 30ml of EDTA solution while 50ml of sample hard water consumed 20ml of EDTA solution. After boiling 50ml of same sample required 10ml of EDTA solution. Calculate the permanent hardness.