Modern Analytical Cheymistry - Chapter 2 docx

... C 2 2 2 × ×= HO g rhubarb ww H O 24 24 10 62 100 0 20 1 . .%/ 2 10 mol C 90.03 g C mol C = 2. 1 32 10 oxalic acid –4 2 2 2 2 .369 24 24 24 ×× ×HO HO HO g 4.737 10 mol Fe 1 mol C mol Fe = 2. 369 ... 1 32 10 10 62 100 0 20 1 2 24 24 . . .%/ – × ×= g C C 2 2 HO g rhubarb ww H O MFWCO CO Fe Fe 33 24 2 24 2 0 0130 2 2 1 32 10 ++ ×× = =× V H M)(0.0364...

Ngày tải lên: 13/08/2014, 02:20

... Arsenault, 1996; Levine et al., 1999; Betinelli et al., 20 00; Falciani et al., 20 00; Chen and Ma, 20 01; Ivanova et al., 20 02; Sun et al., 20 01). Microwave-assisted aqua regia digestion using a Teflon bomb ... during digestion (Ryss, 1956; Wu et al., 1996): 6HF þ SiO 2 ! H 2 SIF 6 þ 2H 2 O H 3 BO 3 þ 3HF ! HBF 3 OH þ 2H 2 O HBF 3 OH þ HF ! HBF 4 þ H 2 O Adding boric acid in...

Ngày tải lên: 11/08/2014, 12:21

... Calculations 20 2C.1 Conservation of Mass 22 2C .2 Conservation of Charge 22 2C.3 Conservation of Protons 22 2C.4 Conservation of Electron Pairs 23 2C.5 Conservation of Electrons 23 2C.6 Using Conservation ... 607 12J.5 Evaluation 609 12K Key Terms 609 12L Summary 610 12M Suggested Experiments 610 12N Problems 615 viii Modern Analytical Chemistry 12O Suggested Readings 620 1...

Ngày tải lên: 13/08/2014, 02:20

... Part I-Talanta, 1970, 17, 21 29 ; Part II-Talanta, 1970, 17, 31–44; Part III-Talanta, 1973, 20 , 725 –7 32; Part IV- Talanta, 1974, 21 , 1109–1 121 . Several texts provide numerous examples of analytical ... Technol. 1989, 23 , 768–774. 12. Jiménez-Prieto, R.; Velasco, A.; Silva, M.; et al. Anal. Chim. Acta 19 92, 26 9, 27 3 27 9. 13. Oungpipat, W.; Alexander, P. W. Anal. Chim. Acta...

Ngày tải lên: 13/08/2014, 02:20

... n A A B B A AA B BB 22 2 22 22 11 2 s nsns nn pool A A B B AB = −+− +− ()()11 2 22 t XX snn exp (/ ) (/ ) = − + AB pool 11 AB t XX sn sn exp (/ ) (/) = − + AB A 2 A B 2 B XXt s n s n AB −=× + A 2 A B 2 B X ts n X ts n A A A B B B ±=± Chapter ... States Penny in Circulation Mass Replicate Number (g) 1 3. 025 2 3. 024 3 3. 028 4 3. 027 5 3. 028 6 3. 023 7 3. 022 8 3....

Ngày tải lên: 13/08/2014, 02:20

... Replicates added (µA) 0.000 2. 53 2. 50 2. 70 2. 63 2. 70 2. 80 2. 52 0.387 8. 42 7.96 8.54 8.18 7.70 8.34 7.98 1.851 29 .65 28 .70 29 .05 28 .30 29 .20 29 .95 28 .95 5.734 84.8 85.6 86.0 85 .2 84 .2 86.4 87.8 Determine ... x sx nxx b i i i i i 0 22 = ∑ ∑∑ = ∑ ∑ r 22 2 r 22 –( ) ( – ) s ns nx x s xx b i ii 1 r 2 2 r 2 = ∑∑ = ∑ –( ) ( – ) 22 s y–y n ii i n r...

Ngày tải lên: 13/08/2014, 02:20

... Cu 2+ , Zn 2+ , Sn 2+ , Mn 2+ , Fe 2+ , Ni 2+ , Co 2+ 0.6 Sr 2+ , Ba 2+ , Cd 2+ , Hg 2+ , S 2 0.5 Pb 2+ , CO 3 2 , SO 3 2 0.45 Hg 2 2+ , SO 4 2 , S 2 O 3 2 , CrO 4 2 , HPO 4 2 0.40 Al 3+ , ... [] [][] [] [][] [] [][] [] [][] [] [][] K K KKK 1 22 2 23 12 22 2 2 AB A B AB AB 22 1 2 2 2 1 t +== [][] [] K K ABAB AB AB + =2 21 2 2...

Ngày tải lên: 13/08/2014, 02:20

... n s . n s ==≈ (. )(.) (. ) . 2 066 2 0 080 26 7 27 22 2 n s ==≈ (. )(.) (. ) . 2 075 2 0 080 26 9 27 22 2 n s == (. )(.) (. ) 196 20 080 24 22 2 n ts e s s = 22 2 µ= ±X ts n s s 1400-CH07 9/8/99 4:03 ... 1.078 0.10 12 0.413 0.1010 1 .24 8 0.1060 0.654 0.0997 0.507 0 .25 0 .25 15 0.847 0 .24 65 0.598 0 .27 70 0.431 0 .24 60 0.8 42 0 .24 85 0.964 0 .25 90 1.178 0.5...

Ngày tải lên: 13/08/2014, 02:20

... NO) 23 23 96 3 96 3 23 96 3 23 96 3 96 3 96 3 25 2 Modern Analytical Chemistry 1400-CH08 9/9/99 2: 18 PM Page 25 2 26 2 Modern Analytical Chemistry EXAMPLE 8. 7 A 26 .23 -mg sample of MgC 2 O 4 •H 2 O ... Reaction OH – (NH 2 ) 2 CO+3H 2 O t 2NH 4 + +CO 2 + 2OH – SO 4 2 NH 2 HSO 3 +2H 2 O t NH 4 + +H 3 O + +SO 4 2 S 2 CH 3 CSNH 2 +H 2 O t CH 3 CONH...

Ngày tải lên: 13/08/2014, 02:20

... Comment Na 2 CO 3 Na 2 CO 3 +2H 3 O + → H 2 CO 3 + 2Na + +2H 2 Oa TRIS (HOCH 2 ) 3 CNH 2 +H 3 O + →(HOCH 2 ) 3 CNH 3 + +H 2 Ob Na 2 B 4 O 7 Na 2 B 4 O 7 +2H 3 O + +3H 2 O → 2Na + +4H 3 BO 3 Standardization ... 1.85 22 .00 2. 08 24 .00 2. 57 25 .00 7.00 26 .00 11. 42 28.00 11.89 30.00 12. 50 35.00 12. 37 40.00 12. 52 45.00 12. 62 50.00 12. 70 1400-CH09 9/9/99 2:...

Ngày tải lên: 13/08/2014, 02:20