- Arts & Culture 6126
- Business & Economics 670
- Computers 309
- Dictionaries & Encyclopedias 68
- Education & Science 75536
- Abstracts 73
- Astrology 4
- Astronomy 1
- Biology 8
- Chemistry 3115
- Coursework 15556
- Culture 8
- Diplomas 317
- Drawings 1174
- Ecology 5
- Economy 82
- English 78
- Ethics, Aesthetics 3
- For Education Students 17220
- Foreign Languages 11
- Geography 3
- Geology 1
- History 88
- Maps & Atlases 5
- Mathematics 13869
- Musical Literature 2
- Pedagogics 19
- Philosophy 23
- Physics 15094
- Political Science 5
- Practical Work 59
- Psychology 60
- Religion 4
- Russian and culture of speech 8
- School Textbooks 7
- Sociology 9
- Summaries, Cribs 87
- Test Answers 155
- Tests 7905
- Textbooks for Colleges and Universities 32
- Theses 7
- To Help Graduate Students 14
- To Help the Entrant 37
- Vetting 366
- Works 13
- Информатика 9
- Engineering 875
- Fiction 670
- House, Family & Entertainment 89
- Law 133
- Website Promotion 71
137. Solving a chemistry problem
Refunds: 0
Uploaded: 20.05.2022
Content: 21.rar 29,17 kB
Product description
To determine the lead content, a 5.00 ml blood sample was treated with tichloroacetic acid for protein coagulation and centrifuged. The resulting solution was adjusted to a pH of 3, a solution of ammonium pyrrolidinedithiocarbaminate was added, and the resulting intracomplex lead compound was extracted with two portions of 5.00 ml of methyl isobutyl ketone. The extracts were combined, sprayed in an acetyl-air flame. Optical density measured at 283.3 nm was 0.502. For two aliquots of 5.00 ml of standard solutions containing 0.40 and 0.60 μg of lead and treated in a similar way, the optical densities were 0.396 and 0.599. Calculate the amount of lead (μg) in the blood sample.
Feedback
0Period | |||
1 month | 3 months | 12 months | |
0 | 0 | 0 | |
0 | 0 | 0 |