50 ml of water sample requires 15 ml of 0.02 M EDTA during titration . whereas 50 ml of boiled water sample requires 11 ml of same EDTA in the titration. Calculate total,temporary and permanent hardness of water sample.
Answers
Answer:
Explanation:
the ans is 200ppm
Answer:
Total hardness= 300 ppm
Permanent hardness=100 ppm
Temporary hardness= 200ppm
Explanation:
Total hardness=0.30g or 300mg of CaCO3 eq
=300 ppm
50 ml of boiled water=5 ml of 0.01 M EDTA
=100 mL of 0.01 M EDTA
=200ml or 0.2 L of 0.01 M EDTA
=0.2*0.01*50 g of CaCO3 eq
=0.1 g or 100mg of CaCO3 eq
Permanent hardness=100 ppm
Temporary hardness=300-100= 200ppm
Permanent hardness :
The presence of dissolved calcium, magnesium, iron, and other metal chlorides, nitrates, and sulphates results in permanent hardness. We refer to the presence of soluble magnesium and calcium salts in the form of chlorides and sulphides in water as permanent hardness since boiling cannot dissolve this hardness. By adding washing soda to the water, we can soften it up. Scratch, rebound, and indentation hardness are the three different types of hardness. Each sort of hardness can only be measured with a certain set of tools.
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