- Arts & Culture 6151
- Business & Economics 674
- Computers 315
- Dictionaries & Encyclopedias 69
- Education & Science 77343
- Abstracts 74
- Astrology 4
- Astronomy 1
- Biology 8
- Chemistry 3307
- Coursework 15556
- Culture 8
- Diplomas 317
- Drawings 1551
- Ecology 5
- Economy 81
- English 80
- Ethics, Aesthetics 3
- For Education Students 17641
- Foreign Languages 11
- Geography 3
- Geology 1
- History 88
- Maps & Atlases 5
- Mathematics 13868
- Musical Literature 2
- Pedagogics 19
- Philosophy 23
- Physics 15112
- Political Science 5
- Practical Work 59
- Psychology 59
- Religion 4
- Russian and culture of speech 8
- School Textbooks 7
- Sociology 9
- Summaries, Cribs 87
- Test Answers 155
- Tests 8696
- Textbooks for Colleges and Universities 32
- Theses 7
- To Help Graduate Students 14
- To Help the Entrant 38
- Vetting 374
- Works 13
- Информатика 8
- Engineering 875
- Fiction 671
- House, Family & Entertainment 88
- Law 133
- Website Promotion 70
0731. Solving a chemistry problem
Content: 1.zip 19,5 kB
Product description
1. Calculate the percentage of vinpocetine in vinpocetine tablets from the declared amount of vinpocetine, if a sample of powdered tablets weighing 0.0101 g was dissolved in a 50 ml volumetric flask. 5.0 ml of the resulting solution was placed in a 25 ml volumetric flask and the volume of the solution was adjusted to the mark with 96% alcohol. The optical density of the resulting solution was 0.603 at 314 nm in a cuvette with a layer thickness of 10 mm. The optical density of the vinpocetine standard sample solution was 0.621 in a cuvette with a layer thickness of 10 mm, the concentration of the vinpocetine standard sample solution was 0.02 mg/ml. The declared content of vinpocetine per tablet is 5 mg, the average tablet weight is 10.2 mg.
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 | |