- Arts & Culture 5967
- Business & Economics 690
- Computers 317
- Dictionaries & Encyclopedias 82
- Education & Science 76527
- Abstracts 226
- Astrology 4
- Astronomy 1
- Biology 8
- Chemistry 2651
- Coursework 15846
- Culture 8
- Diplomas 411
- Drawings 575
- Ecology 6
- Economy 82
- English 78
- Ethics, Aesthetics 3
- For Education Students 17633
- Foreign Languages 11
- Geography 3
- Geology 1
- History 89
- Maps & Atlases 5
- Mathematics 13871
- Musical Literature 2
- Pedagogics 19
- Philosophy 23
- Physics 15035
- Political Science 5
- Practical Work 101
- Psychology 60
- Religion 4
- Russian and culture of speech 8
- School Textbooks 7
- Sexology 42
- Sociology 9
- Summaries, Cribs 87
- Test Answers 154
- Tests 8965
- Textbooks for Colleges and Universities 32
- Theses 24
- To Help Graduate Students 14
- To Help the Entrant 37
- Vetting 364
- Works 13
- Информатика 10
- Engineering 3062
- Fiction 695
- House, Family & Entertainment 106
- Law 133
- Website Promotion 71
137. Solving a chemistry problem
Uploaded: 21.05.2022
Content: 27.rar 40,92 kB
Product description
To construct a calibration graph for the determination of manganese, the volumes of a standard manganese solution (C-1.25 mg / ml) indicated below were introduced into volumetric flasks of 250.0 cm3 and manganese was oxidized to permanganate ion. Optical density was measured relative to a solution prepared from 10.0 cm3 of a standard solution and the following values were obtained:
V, cm3 10.0 11.0 12.0 13.0 14.0 15.0
A 0.00 0.20 0.40 0.60 0.80 1.01
A sample of ore weighing 0.5000 g was dissolved and after oxidation of manganese to the permanganate ion, the solution was diluted with water to 250.0 cm3. The optical density for the resulting colored solution under the same conditions was 0.320. Determine the content (%) of manganese in the ore.
Feedback
0| Period | |||
| 1 month | 3 months | 12 months | |
| 0 | 0 | 0 | |
| 0 | 0 | 0 | |