- Arts & Culture 6205
- Business & Economics 676
- Computers 330
- Dictionaries & Encyclopedias 70
- Education & Science 76906
- Abstracts 73
- Astrology 4
- Biology 8
- Chemistry 3979
- Coursework 15556
- Culture 8
- Diplomas 316
- Drawings 1596
- Ecology 5
- Economy 81
- English 80
- Ethics, Aesthetics 3
- For Education Students 17651
- 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 65
- 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 382
- Works 13
- Информатика 8
- Engineering 872
- Fiction 708
- House, Family & Entertainment 84
- Law 133
- Website Promotion 70
141. Solving a chemistry problem
Refunds: 0
Uploaded: 13.05.2022
Content: нефелинового сенита.rar 32,36 kB
Product description
A weighed portion of nepheline syenite weighing m g was treated with a mixture of hydrofluoric and nitric acids and diluted to 100.0 ml.
Solid calcium nitrate was added to an aliquot of 10.00 ml, and an excess of EDTA was added at pH 3 to keep the quencher impurities in solution. Uranium was separated by extraction with a solution of tributyl phosphate in carbon tetrachloride and re-extracted from the organic phase into an aqueous solution of sodium trimetaphosphate.
To plot the calibration graph, we used aqueous solutions of uranyl nitrate containing 1.0; 3.0; 5.0; 7.0 and 9.0 μg U / ml, respectively, subjecting them to extraction and re-extraction according to the same procedure. The luminescence intensity of standard solutions turned out to be 20, 55, 90, 125, 160
Determine the mass fraction (%) of uranium in the mineral, if the luminescence intensity of the analyzed solution (1X) was:
Option 1
m. g. 2.021
Ix. 35
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 | |