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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.

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. Correct Answer 332ppm

For 50ml of boiled water requires the 10ml of EDTA solution that is 10*(50/30) mg of CaCO3. The 1000ml of the boiled water requires the 10*(50/30)*20=322mg of CaCO3. It means permanent hardness is 322ppm.

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