LPU GUIDE



Numerical problems:

1. A water sample contains Mg(HCO3)2 =18.2mg/l and CaSO4 = 4.1 mg/l. Calculate the Total hardness in 0Cl.

2. A hard water sample contains 150 ppm of temporary hardness and 250 ppm of permanent hardness. Calculate total hardness in mg/l, ppm, 0Cl and 0Fr.

3. How many grams of Ca(HCO3)2 dissolved per liter give 100 ppm hardness.

4. A water sample contains 250 mg of MgCl2 per liter. Calculate the hardness in terms of CaCO3 equivalent.

5. How many grams of MgCO3 dissolved per liter give 120 ppm hardness?

6. A 500 ml water sample has hardness equivalent for 50 ml of 0.05 N CaSO4. What is the hardness in ppm?

7. A water sample (500ml) has hardness equivalent to 50 ml of 0.1N MgSO4. What is the hardness in ppm?

8. When 50 ml of sample hard water was titrated against 0.01M EDTA, 48 ml of EDTA was required for titration. Now 50 ml of water sample from the same source after boiling and filtering required 35 ml of EDTA. Calculate the total hardness, temporary hardness and permanent hardness.

9. 10 ml Water sample required 15 ml of EDTA. Calculate its hardness in ppm. Given that 15 ml of CaCl2 solution whose strength is equivalent to 3.0g of CaCO3 per liter required 30 ml of EDTA solution.

10. 1gm of CaCO3 was dissolved in dilute HCl and the solution diluted to 1liter. Then 100 ml of this solution required 90 ml of EDTA solution. Also 100 ml of water sample require 36 ml of same EDTA solution. The water sample (100ml) on boiling was titrated against 18 ml EDTA solution. Calculate the total temporary and permanent hardness.

................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download