Boiler and Water

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  • Topic: Boiler, Bicarbonate, Hard water
  • Pages : 2 (565 words )
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  • Published : January 26, 2013
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AMITY SCHOOL OF ENGINEERING AND TECHNOLOGY
AMITY UNIVERSITY

APPLIED CHEMISTRY-I Semester

Tutorial Sheet - I (Water Treatment)

1 What are the specifications of water for various industries?

2. Why does hard water consume a lot of soap?

3. What is the difference between soft and sterilized water? 4. State chemical reactions, which remove bicarbonate hardness and justify your answer 5. Why is NH3-NH4Cl buffer added in the determination of hardness of water? 6. Discuss which of the following substances will increase, decrease or have no effect on the hardness of water: Ca (OH)2, Mg(HCO3)2, MgSO4, Ca(HCO3)2, CaSO4, CaCl2, KCl, NH4Cl, NH4OH, NH4)2CO3, Na2SO4, BaCO3, NaCl, NaOH, Na2CO3, Na3PO4, NaAlO2, Na2[Na4(PO3)6].

7. 0.5 g CaCO3 was dissolved in dil HCl and diluted to 500 ml. 50 ml of this required 40 ml EDTA. 100 ml hard water required 50 ml EDTA and after boiling 50 ml consumed 20 ml EDTA. Calculate temporary hardness. 8. Why is calgon conditioning better than phosphate conditioning? 9. Compare carbonate conditioning and phosphate conditioning of boiler water with respect to the principles involved, advantages and limitations. 10. Establish the relation between mg/l and ppm.

11. Is boiled water 100% safe for drinking. Why?
12. Ca(HCO3)2 causes scale formation in low pressure boilers and not in high pressure boilers. Why? 13. What is priming? How is it caused? What are its disadvantages? 14. Why silica, oil and dissolved gases should not be present in boiler feed water. 15. What may be the consequences of using water containing MgCl2, CaCO3 and SiO2 in boilers? Also give remedial measure for the same.

AMITY SCHOOL OF ENGINEERING AND TECHNOLOGY
AMITY UNIVERSITY

APPLIED CHEMISTRY-I Semester

Tutorial Sheet -II (Water Treatment)

1) Can alkalinity of water be due to presence of OH-, CO32- and HCO3- simultaneously? Explain. Prove that if P>1/2M, CO32- = 2(M-P).
2) A sample of water was alkaline both...
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