1. The document discusses proper laboratory techniques for using analytical balances, burettes, volumetric pipettes, and volumetric flasks. It provides step-by-step instructions for weighing samples, calibrating and using burettes for titration, ensuring accurate volume transfers with pipettes and flasks, and cleaning and storing equipment properly. 2. Key points covered include filling pipettes by vacuum, allowing complete drainage and avoiding residual liquid, rinsing equipment thoroughly, and reading burette measurements accurately by sighting the bottom of the meniscus at the top of the graduation line. 3. The document concludes with thanking all participants and discussing group and household tasks.

1. 11/21/2015 Mosarof Hossan 1

2. 11/21/2015 Mosarof Hossan 2

3. শিখণ ফল
11/21/2015 3Mosarof Hossan
1.3 j¨ve‡iUwi, hš¿cvwZI Møvm mvgMÖx cwi®‹vi Kivi
†KŠkj ej‡Z cvi‡e|
1.4 cjÑeyw½ e¨v‡jÝ, wWwRUvj e¨v‡jÝ (2-wWwRU I 4-
wWwRU)†gRvwis wmwjÛvi, ey¨‡iU, AvqZbwgwZK d¬v¯‹ I
wc‡cU e¨env‡ii †¶Î Ges e¨envi wewa Rvb‡Z cvi‡e|

4. Must
Drain Evenly
Not
Clean
11/21/2015 4Mosarof Hossan

5. Properly
Dispose
Excess
Properly
Clean
Air
Dry
11/21/2015 5Mosarof Hossan

6. Properly
Clean
Air
Dry
11/21/2015 6Mosarof Hossan

7. Transfer
To
Reagent
Bottle
Properly
Clean
Air
Dry
11/21/2015 7Mosarof Hossan

8. Balances
Top-loading Analytical
11/21/2015 8Mosarof Hossan

9. Tools for weighing
11/21/2015 9Mosarof Hossan

10. Steps in weighing
(balance in chemical stockroom)
11/21/2015 10Mosarof Hossan

11. BURET
11/21/2015 11Mosarof Hossan

12. To
Deliver
Calibration
Temperature
BURET
11/21/2015 12Mosarof Hossan

13. Completely
Coat
Inside
Surface
Rinse
With Titrant
11/21/2015 13Mosarof Hossan

14. Not
Clean
Beads
of
Liquid
11/21/2015 14Mosarof Hossan

15. Rinse
Three
Times
Fill to Above
Top Graduation
11/21/2015 15Mosarof Hossan

16. Discharge
All
Air
Bubbles
11/21/2015 16Mosarof Hossan

17. Drain
Until
Top
of
Liquid
Is In
Graduations
11/21/2015 17Mosarof Hossan

18. Curved
Surface
of Liquid MENISCUS
11/21/2015 18Mosarof Hossan

19. MENISCUS
READER
11/21/2015 19Mosarof Hossan

20. X
X
O
Proper Reading
11/21/2015 20Mosarof Hossan

21. Bottom
of
Meniscus
to
Top of Graduation
11/21/2015 21Mosarof Hossan

22. Increase Ten
Graduations
11/21/2015 22Mosarof Hossan

23. 9.64
24.16
11/21/2015 23Mosarof Hossan

24. Record
Initial
Reading
Add
Indicator
Proper
Grip
11/21/2015 24Mosarof Hossan

25. Mix
Well
Near
Endpoint
11/21/2015 25Mosarof Hossan

26. At Endpoint
Read Record
Final
Reading
Final Reading – Initial Reading = Volume Delivered
11/21/2015 26Mosarof Hossan

27. Volumetric
Transfer
Pipets
11/21/2015 27Mosarof Hossan

28. Fill
By
Vacuum
11/21/2015 28Mosarof Hossan

29. Fill
By
Vacuum
Pipet
Bulb
Rinse
11/21/2015 29Mosarof Hossan

30. Must
Drain Evenly
Not
Clean
11/21/2015 30Mosarof Hossan

31. Allow
To
Drain
Touch
Tip
To
Flask
Some
Will
Remain
In
Tip
11/21/2015 31Mosarof Hossan

32. Volumetric Flasks
11/21/2015 32Mosarof Hossan

33. TC
To
Contain
NOT Intended To Deliver
11/21/2015 33Mosarof Hossan

34. Fill
Half
And
Mix
Fill
To
Below
Graduation
Fill
Drop-wise
To
Calibration
11/21/2015 34Mosarof Hossan

35. K)1 MÖvg †mvwWqvgKve©‡bU mwVK fv‡e
IRbKi|
L) wc‡c‡Ui mv‡h¨ 10 wgwj `ªebbvI|
দলগত কাজ
11/21/2015 35Mosarof Hossan

36. বাড়ীর কাজ
M) †gRvwis wmwjÛvi,ey¨‡iU,
AvqZbwgwZK d¬v¯‹ I wc‡c‡Ui wPÎ
AsKbKi|
11/21/2015 36Mosarof Hossan

37. ধন্যবাদ
সকলকক
11/21/2015 37Mosarof Hossan