- Arts & Culture 6242
- Business & Economics 673
- Computers 316
- Dictionaries & Encyclopedias 74
- Education & Science 77001
- Abstracts 73
- Astrology 4
- Biology 8
- Chemistry 4046
- Coursework 15557
- Culture 8
- Diplomas 317
- Drawings 1595
- Ecology 5
- Economy 81
- English 80
- Ethics, Aesthetics 3
- For Education Students 17674
- Foreign Languages 11
- Geography 3
- Geology 1
- History 88
- Maps & Atlases 5
- Mathematics 12624
- Musical Literature 2
- Pedagogics 21
- Philosophy 22
- Physics 15120
- Political Science 5
- Practical Work 59
- Psychology 64
- Religion 4
- Russian and culture of speech 8
- School Textbooks 7
- Sociology 9
- Summaries, Cribs 87
- Test Answers 160
- Tests 8753
- 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 891
- Fiction 706
- House, Family & Entertainment 76
- Law 130
- Website Promotion 70
38. Solving a chemistry problem
Refunds: 0
Uploaded: 14.03.2023
Content: 186.rar 17,36 kB
Product description
186. We took three weighings of trichlorosilane weighing 5.0000 g each. The first weighing was decomposed with HF and HCl, and after adding lumokupferon, 50 ml of a solution was obtained, the luminescence intensity of which was 55.0 c.u. From the second sample, as a result of appropriate processing, 10 ml of a solution was obtained, 5.0000 μg of copper, lumokupferon were added, and then diluted to 50 ml. The fluorescence intensity of this solution is 110 a.u. The third sample, containing no traces of copper, was treated in the same way as the first, and 50.0 ml of a solution was obtained, the fluorescence intensity of which turned out to be equivalent to the fluorescence intensity of 1.5000 μg of copper. Calculate the mass fraction of copper (%) in trichlorosilane.
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 | |