engineering chemistry lab viva questions with answers
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Engineering Chemistry LAB VIVA Questions 

1. What are hard waters?

2. How are waters classified according to the degree of hardness?
3. How is water hardness produced?
4. How is temporary hardness eliminated?
5. How do you express the total hardness of water?
6. What is EDTA?
7. Write the structural formula for EDTA.
8. Why is disodium salt preferred from EDTA to EDTA?
9. Why is ammonia solution added while the EDTA solution is being prepared?
10. What is the buffer solution?
11. Why is ammonia-ammonium chloride buffer added?
12. Why does the Eriochrome Black (EBT) indicator show red wine at the beginning and blue at the end?
13. Why is the titration involving EDTA carried out slowly towards the end point?
14. What is the application of hardness in the practice of environmental engineering?
15. What are the components of cements?
16. What are the main components of cement?
17. Why is the role of glycerol and NaoH?
18. What is the function of diethyl amine?
19. Why can not the Eriochrome Black T indicator be used in this experiment?
20. What is the indicator used in the determination of CaO I cement solution?
21. What are the components of Brass?
22. How is the brass solution prepared?
23. What is the purpose of adding urea?
24. Why is ammonium hydroxide added to the brass solution?
25. What is the blue-white precipitate formed after adding ammonia solution?
26. Why is acetic acid added?
27. How is the liberated iodine calculated?
28. What is the reaction between iodine and sodium thiosulphate?
29. Why is the starch indicator added to the end point?
30. What is the white precipitate produced at the end of the point?
31. What is the minimum of hematite ore?
32. Give others the form of iron ore.
33. What is the role of stannous chloride?
34. Why is mercuric chlorine added?
35. What happens when the excess of stannous chloride is not removed
36. What is the indicator used?
37. Why is the color of the indicator drop still the same at the end point?
38. What is the reaction that occurs during the titration?
39. What is weak acid?
40. What is acid pKa?
41. What is meant by pH of a solution?
42. What is the modern definition (IUPAC) of pH?
43. Why is an electrode-selective ion called the glass electrode?
44. How is pH measured?
45. How are pH and pKa related?
46. How is pH measured?
47. How are pH and pKa related?
48. How does pKa relate to the strength of a weak acid?
49. What are the electrodes used in pH measurement for the determination of pKa?
50. Why does the pH suddenly increase after the equivalence point?
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