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| A B C D | Iodometry Permanganatometry Complexonometry Neutralization | ZnSO4 or Zn (metallic) Na2B4O7 (borax) KMnO4 (potassium permanganate) H2C2O4 (oxalic acid) | Answer: А - _______; В - _______; С - _______; D - _______. |
11. This figure demonstrates the curve of titration of _______ (weak or strong) _________ (acid or base) by _________ (weak or strong)____________ (acid or base).
12. Calculate ionic power µ (or I) of solution, contained 0,1 M Na3PO4 in 1 L.
| 1. | 3,0; | Answer:____________________ |
| 2. | 2,5; | |
| 3. | 2,0; | |
| 4. | 0,6. |
13. Note relative specific reagent of Ni2+ cation
| Dimethylgloxime (Chugaev’s reagent) C4H8N2O2 | Answer:___________________ | |
| Zinc-Uranyl-Acetate Zn(UO2)3(CH3COO)8 in presence of acetic acid CH3COOH | ||
| Potassium hexahydroxostibiate (V) K[Sb(OH)6] | ||
| Ammonium Hydrophosphate (NH4)2HPO4. |
14. To propose the buffer mixture, using proposed reactants (possible more than one true variant)
| HCl, H3PO4; CH3COOH | Answer:________________________________________ | |
| NH4OH, NH2OH; KOH | ||
| NH4Cl, Na2HPO4; NaH2PO4 |
15. Equivalent concentration is shown:
| Quantity of soluble substance in equivalents per 1 L of solution; | Answer:_____________ | |
| Quantity of soluble substance in mol per 1 L of solution; | ||
| Quantity of soluble substance in mol per 1 kg of solution; | ||
| Quantity of soluble substance in mol per 100 g of solution. |
16. The sensitivity of the qualitative analytical reaction DOESN’T characterize by item:
| Minimum concentration; | Answer:_____________ | |
| Maximum dilution; | ||
| Detectable minimum; | ||
| Ionic strength. |
17. Calculate pH of 0,01 N CH3COOH (pK=4,76):
| 3,38; | pH (weak acid)=____________________________ Answer:____________ | |
| 5,68; | ||
| 10,12; | ||
| 0,15. |
18. Determine the types of sediments in gravimetry
| A B | Crystalline Amorphous | MgNH4PO4 H2SiO3 BaSO4 Ni(OH)2 AlPO4 Co(OH)3 | Answer: A -____________; B-____________. |
19. Calculate gravimetric factor f for determination of Ca2+ content in CaCl2·6H2O (M=220,81 g/mol) precipitated in the form of Ca2P2O7 (M=254,10 g/mol):
| 1,7380; | Answer: _________________ | |
| 0,8622; | ||
| 1,1599; | ||
| 0,5799. |
20. Calculate solubility (in mol/L and g/L) of CdS (SP= 2∙10-28, M(CdS) =144,46 g/mol) in solution of 0,001 M Na2S.
| Solution:_________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ Answer:_________ |
21. Calculate mass of ZnSO4∙7H2O (M=287,54 g/mol) for gravimetric analysis in the form of Zn(OH)2 (M = 99,38 g/mol).
| Solution: _________________________________________________________________________ _________________________________________________________________________________ ________________________________________________________________________________ Answer: ___________ |
22. Determine the correspondence between titration system and the best indicator:
| Titration system | Indicator | Answer: A-____________; B-____________; C-____________. | ||
| A. B. C. | 0,1 N acetic acid CH3COOH by 0,1 N Sodium hydroxide NaOH (pHeq=8,87) 0,1 N hydrochloric acid HCl by 0,1 N Ammonium hydroxide NH4OH (pHeq=5,73) 0,1 N hydrochloric acid HCl by 0,1 N Sodium hydroxide NaOH (pHeq=7,00) | Thymol Blue (pT=1,7) Bromophenol blue (pT=4,1) Litmus neutral (pT=7,1) Phenol red (pT=5,8) Cresol red (pT=8,2) Thymol blue (pT=8,9) Phenolphthalein (pT=9,6) Alizarin yellow R (pT=11,3) |
23. Calculate pH of 0,01 N Na2HPO4 (pK1(H3PO4)=1,96; pK2(H3PO4)=6,70; pK3(H3PO4)=12,44):
| 3,38; | Answer: _________________ | |
| 4,33; | ||
| 9,57; | ||
| 12,44. |
24. Qualitative reaction of SiO32- anion with NH4Cl (saturated solution) is accompanied by visual effect of:
| Blue colorizing of solution; | Answer:_____________ | |
| Brown ring; | ||
| Gelatinized precipitation; | ||
| Crimson colorizing of solution. |
25. Calculate equivalent concentration (N) Phosphate acid Н3РО4, prepared by diluting of 10 mL 35% solution with density d=1,2 g/cm3 to the total volume 1 L (М (Н3РО4)=98 g/mol).
| Solution: _________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ Answer:_________________ |
26. Calculate standard EMF of Redox system Pb4+ + 2 I- ↔ Pb2+ + I2, if E° (Pb4+/Pb2+)=+1,660 V; E° (I2/2I-)=+ 0,621 V. Note direction of reaction.
| Solution: _________________________________________________________________________ _________________________________________________________________________________ Answer:_________________ |
27. Calculate dissociation degree α of 0,01 M HF (Kdis=6,8×10-4).
Solution:___________________________________________________
Answer:__ α =______
28. Equivalent mass of Al3+ (A=26,98 g/mol) cation in reaction with Trilon B is:
| 26,98 g-eq/g; | Answer:_____________ | |
| 8,99 g-eq/g; | ||
| 13,49 g-eq/g; | ||
| 6,75 g-eq/g; | ||
| 53,96 g-eq/g. |
29. Note functional group in the formula of Trilon B
| HCOO- | CH2 | CH2 | - COONa | |
| N-____-____-N | ||||
| NaCOO- | CH2 | CH2 | - COOH |
30. Calculate concentration of solution, contained 0,05 g of solute in 100 g of solution.
| 5 ppt; | Answer:_____________ | |
| 0,5 ppt; | ||
| 50 ppt; | ||
| 500 ppt; | ||
| 0,005 ppt. |
НАЦІОНАЛЬНИЙ УНІВЕРСИТЕТ БІОРЕСУРСІВ ТА ПРИРОДОКОРИСТУВАННЯ УКРАЇНИ
Факультет Екології і біотехнології
Напрям підготовки (спеціальність) 0514 – Біотехнологія
(6.051401 – Екобіотехнологія)
Форма навчання денна (англійською мовою)
Семестр 3 Курс 2
ОКР «Бакалавр»
Кафедра аналітичної і біонеорганічної хімії та якості води
Дисципліна Аналітична хімія
Викладач _____ (Войтенко Л.В.)
«Затверджую»
Завідувач кафедри (Косматий В.Є.)
«0 9» грудня 2009 р.
Студент 2 курсу 2 групи факультету екології і біотехнології
(прізвище, ім’я, по-батькові) (підпис)
Дата проведення іспиту – „03” лютого 2010 року.
Білет № 2
1. Put in the sentence a missing figures:
| Semimicro Techniques of the qualitative analysis predict to use _______ g of solid reactants and _________ mL of liquids. |
2. Note specific qualitative reagent of Fe2+ cations is:
| NH3 (concentrated) in excess | Answer:_______________________________ | |
| Yellow blood salt K4[Fe(CN)6] | ||
| Red blood salt K3[Fe(CN)6] | ||
| HCl |
3. To point the correspondence of the compound formulas and type of the analytical reagents (ammonium-phosphate classification): (possible more than one true variant)
| A. B. C. | Group Selective Specific | HCl NaOH K3[Fe(CN)6] NaBiO3 + HNO3 (diluted) H2SO4 (NH4)2HPO4 | Answer: А - ________; С - ________; В -_________; D - ________. |
4. To point the correspondence of the Methods of Detecting Analytes and corresponded their properties (possible more than one true variant)
| A. B. C. | Physical means With electromagnetic radiation (Spectroscopy) By an electric charge | Mass Color Emission Absorption Electrochemistry Refractive index | Answer: А - ________; В -_________; С - ________. |
5. Acid-base system classification of cations uses such group reagents: (possible more than one true variant)
| HCl | Answer:_______________________________ | |
| H2SO4 | ||
| H2S in presence of HCl | ||
| NaOH | ||
| Na2HPO4 |
6. To note correspondence of anions and their group reagents:
| A. B. C. | The 1st group The 2d group The 3d group | SO32- Br- PO43- MoO42- CH3COO- Cl- | Answer: А - ________; В -________; С - ________. |
7. To propose the reagent for the separation of cations:
| Al3+, Mg2+ ↓ |
| ||
| Solution:_______ Cation | Sediment:_______ (chemical formula) |
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| Пояснювальна записка | | | Answer: Formulas of dissolved salts in fresh water:________________________ |