- Arts & Culture 6040
- Books in Foreign Languages 149
- Business & Economics 4477
- Computers 2206
- Dictionaries & Encyclopedias 633
- Education & Science 97294
- Abstracts 1143
- Astrology 12
- Astronomy 13
- Biology 31
- Chemistry 5230
- Coursework 4098
- Culture 30
- Diplomas 2521
- Drawings 1481
- Ecology 29
- Economy 341
- English 1173
- Entomology 2
- Ethics, Aesthetics 23
- For Education Students 26001
- Foreign Languages 114
- Geography 19
- Geology 17
- History 315
- Maps & Atlases 36
- Mathematics 14482
- Musical Literature 7
- Pedagogics 232
- Philosophy 190
- Physics 15880
- Political Science 126
- Practical Work 133
- Psychology 467
- Religion 44
- Russian and culture of speech 101
- School Textbooks 69
- Sexology 68
- Sociology 48
- Summaries, Cribs 717
- Tests 20743
- Textbooks for Colleges and Universities 528
- Theses 190
- To Help Graduate Students 23
- To Help the Entrant 114
- Vetting 430
- Works 59
- Информатика 14
- Engineering 3349
- Esoteric 950
- Fiction 3291
- For Children 383
- House, Family & Entertainment 2498
- Law 2825
- Medicine 1151
- Newspapers & Magazines 344
- Security 275
- Sport, Tourism 998
- Website Promotion 653
Upon condensation with aniline, furfural C4H3OCHO forms
Uploaded: 28.06.2020
Content: фурф.rar 33,07 kB
Product description
Upon condensation with aniline, furfural C4H3OCHO forms a red compound C4H3OCH (C6H4NH2) 2, whose molar absorption coefficient at 518 nm is ε1 518 = 6.20 · 104. Furfural and its derivatives form compounds upon condensation with benzidine
yellow color. At 413 nm, the molar absorption coefficients of the condensation products are: ε1 413 = 2.00 · 102 (for furfural), ε2413 = 1.00 · 103 (for methylfurfural and other derivatives). V (ml) of plastic wastewater was taken for analysis; furfural and its derivatives in a flask with a capacity of 500.0 ml and brought to the mark with water. To a 5.00 ml aliquot was added the prepared reagent mixture containing
aniline, and diluted with water to 20.00 ml. The optical density was measured at 518 nm (A518) in a cuvette l = 1.0 cm. To another 50.0 ml aliquot, a hydrochloride solution of benzidine was added and diluted to 100.0 ml. The optical density was measured at 413 nm (A413) in a cuvette l = 5.0 cm.
Calculate the concentration (mg / l) of furfural (M (C4H3OCHO) = 96.0854 g / mol) and its derivatives based on methyl furfural [M (C5H5OCHO) = 110.1158 g / mol] in wastewater for the following data: