- Arts & Culture 6209
- Business & Economics 674
- Computers 316
- Dictionaries & Encyclopedias 74
- Education & Science 76871
- Abstracts 73
- Astrology 4
- Biology 8
- Chemistry 4046
- Coursework 15549
- Culture 8
- Diplomas 316
- Drawings 1595
- Ecology 5
- Economy 76
- English 80
- Ethics, Aesthetics 3
- For Education Students 17567
- Foreign Languages 11
- Geography 3
- Geology 1
- History 88
- Maps & Atlases 5
- Mathematics 12624
- Musical Literature 2
- Pedagogics 19
- Philosophy 22
- Physics 15120
- Political Science 5
- Practical Work 59
- Psychology 63
- Religion 4
- Russian and culture of speech 8
- School Textbooks 7
- Sociology 9
- Summaries, Cribs 87
- Test Answers 160
- Tests 8747
- Textbooks for Colleges and Universities 32
- Theses 7
- To Help Graduate Students 14
- To Help the Entrant 38
- Vetting 385
- Works 13
- Информатика 8
- Engineering 892
- Fiction 706
- House, Family & Entertainment 84
- Law 128
- Website Promotion 68
2. Solving a chemistry problem
Content: 3.zip 44,53 kB
Product description
3. To build a calibration graph, 250 ml were placed in volumetric flasks, 11.0 was placed; 12.0; 13.0; 14.0;15.0 standard solution containing 1.25 mg/ml Mn and oxidized manganese to permanganate. The optical density was measured relative to a solution containing 12.5 mg Mn in 250 ml and received:
V, ml 11.0 12.0 13.0 14.0 15.0
D 0.200 0.400 0.600 0.800 1.01
A sample of ore weighing 0.500 g was dissolved and the solution was diluted to 1000 ml. In 50 ml of the filtrate, Mn was oxidized to permanganate and the solution was diluted to 250 ml. The static density of the resulting solution is 0.320. Calculate the mass fraction (%) of Mn in the ore.
Additional information
If you do not open the file - install the RAR archiver. Inside the archive you will find a solution in Word format.
Feedback
0| Period | |||
| 1 month | 3 months | 12 months | |
| 0 | 0 | 0 | |
| 0 | 0 | 0 | |