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| A B C D | Neutralization Complexonometry Iodometry Permanganatometry | Na2S2O3 (Sodium Thyosulfate) HCl (Hydrochloric acid) Na2EDTA (trilon B) KMnO4 (potassium permanganate) | Answer: А - _______; В - _______; С - _______; D - _______. |
8. This figure demonstrates the curve of titration of _______ (weak or strong) _________ (acid or base) by _________ (weak or strong)____________ (acid or base).
9. Calculate ionic power µ (or I) of solution, contained 0,02 M CaCl2 in 1 L.
| 1. | 0,05 | Answer:____________________ |
| 2. | 0,03 | |
| 3. | 0,06 | |
| 4. | 0,09 |
10. Note relative specific reagent of Fe2+ cation
| Sodium Bismuthate NaBiO3Zinc-Uranyl-Acetate | Answer:___________________ | |
| Potassium ferrocyanide K3[Fe(CN)6] | ||
| Potassium ferricyanide K4 [Fe(CN)6] | ||
| Ammonium Hydrophosphate (NH4)2HPO4. |
11. To propose the buffer mixture, using proposed reactants (possible more than one true variant)
| HCl, CH3COOH | Answer:_______________________________ _______________________________ | |
| NH4OH, LiOH | ||
| NH4Cl, LiCl, CH3COONa |
12. ppm concentration is shown:
| Quantity of soluble substance in equivalents per 1 000 L of solution; | Answer:______ | |
| Quantity of soluble substance in grams per 1 000 grams of solution; | ||
| Quantity of soluble substance in grams per 1 000 000 grams of solution; | ||
| Quantity of soluble substance in mol per 100 g of solution. |
13. Note the most sensitive reactions for the next cations:
| A. B. C. | NH4+ Na+ K+ | 1. 2. 3. 4. 5. 6. | Zinc-Uranyl-Acetate Zn(UO2)3(CH3COO)8 Nessler’s reagent K2[HgI4]+KOH Sodium hydrotartrate NaHC4H4O6 Potassium hexanitritocobaltate (III) Na3[Co(NO2)6] Alkalis at heating Potassium hexahydroxostibiate K[Sb(OH)6] | Answer: А - ______; В - ______; С - ______. |
14. To note heterogeneous systems, formed at mixing of solutions by pairs
KOH; HCl; H3PO4; Al(OH)3
Answer:________- _____.
15. To write reaction of Ni2+ Chloride and Dimethylglioxime (Chugaev’s reagent) C4H8N2O2 in ammonia medium (pH=9) (in molecular form) excess of ammonia thiocyanate in molecular form (coordinative number of Co3+ is 6) and to calculate the sum of coefficients in this reaction (remember, that absence of coefficient before formula means figure 1):
__________ + ___ ____________ → _____________________ + __ ______________
Sum of coefficients: ______
16. It is necessary for preparation of amphoteric sediment:
| To precipitate of hot concentrated solutions; | Answer:____________ | |
| To precipitate of cold diluted solutions; | ||
| To precipitate of hot diluted solutions; | ||
| To precipitate of cold concentrated solutions. |
17. Red-Ox potential of system CrO42-/Cr3+ in acidic medium at pH=1 and concentrations of [CrO42-]=0,1 M; [Cr3+]=0,01 M is (E0 = +1,36 V):
| + 1,456 V; | Answer:____________ | |
| + 1,222 V; | ||
| + 1,486 V; | ||
| + 1,782 V. |
18. Determine mass of MgSO4·7H2O (M=246,47 g/mol) for gravimetric determination of Magnesium content in the form of sediment MgNH4PO4 (M=137,35 g/mol):
Solution: _________________________________________________________________________
_________________________________________________________________________________
Answer:_________________
19. Note the name of this phenomenon
| ←? Answer:_________________ |
20. Calculate solubility (in mol/L and g/L) of SrCO3 (SP= 5,60·10-10, M(SrCO3)= 147,63 g/mol) in the solution of ionic power 0,05 M (activity coefficients – see Appendix).
| Solution:_________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ Answer:_________ |
21. What sediment is the best choice for gravimetric determination of zinc (II):
| ZnSe (SP=1·10-31) | Answer:____________ | |
| ZnCO3 (SP=1,45·10-11) | ||
| ZnS (SP=2·10-25) | ||
| ZnSO3(SP=1,2·10-17) |
22. Determine note of molarity (M):
Answer: Molarity is_______________________________________________________________
_________________________________________________________________________________
23. Calculate pH of 0,01 N (NH4)2CO3 (pK1 (H2CO3) =6,35; pK(NH4OH) =4,75).
Solution: _________________________________________________________________________
_________________________________________________________________________________
Answer: ___________
24. Calculate titr T of 15% H2SO4 solution (density d=1,102 g/cm3, M=98,00 g/mol):
| 6,0497 g/mL; | Answer:_____________ | |
| 0,3490 g/mL; | ||
| 0,1653 g/mL; | ||
| 0,1790 g/mL. |
25. Calculate pH of buffer solution, contained 1 mol CH3COOH and 0,01 mol CH3COONa in 1 L (pKacid =4,75).
| Solution: _________________________________________________________________________ _________________________________________________________________________________ Answer:_________________ |
26. Calculate Redox potential of solution, contained 0,1 N К2CrO4 and 0,1 N CrCl3 per 1 L at рН=1 (Eo = + 1,33 V).
| Solution: _________________________________________________________________________ _________________________________________________________________________________ Answer:_________________ |
27. Indicators of complexonometry are:
| Weak organic bases and bases; | Answer:_____________ | |
| Strong organic acids; | ||
| Red-Ox systems; | ||
| Weak ligands, formed color compexes with metal cations. |
28. Equivalent mass of H3PO4 (A=98,00 g/mol) for neutralization method:
| 98,00 g-eq/g; | Answer:_____________ | |
| 49,00 g-eq/g; | ||
| 32,67 g-eq/g; | ||
| 13,75 g-eq/g; | ||
| 190,22 g-eq/g. |
29. Put in the sentence a missing words:
| ______________ indicators are oxidation-reducing pairs, where oxidized and reduced forms differ in color. |
30. Determine the correspondence between titration system and the best indicator:
| Titration system | Indicator | Answer: A-____________; B-____________; C-____________. | ||
| A. B. C. | 0,1 N hydrochloric acid HCl by 0,1 N Sodium hydroxide NaOH (pHeq=7,00) 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) | Alizarin yellow R (pT=11,3) Thymol Blue (pT=1,7) Phenol red (pT=5,8) Bromophenol blue (pT=4,1) Litmus neutral (pT= 7,1) Thymol blue (pT=8,9) Cresol red (pT=8,2) Phenolphthalein (pT=9,6) |
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 № 5
1. Put in the sentence a missing words:
| Detectible minimum (m) is the _____________ quantity of substance or ion, which can be detected by given reaction at certain conditions. |
2. Note specific qualitative reagent of Co2+ cations:
| NH4SCN in acetone | Answer:______________________ | |
| Yellow blood salt K4[Fe(CN)6] | ||
| Red blood salt K3[Fe(CN)6] | ||
| Dimethylglioxime (Chugaev’s reagent) C4H8N2O2 |
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. | Specific Selective Group | (NH4)2HPO4 Potassium hexanitritocobaltate (III) Na3[Co(NO2)6] Nessler’s reagent K2[HgI4]+KOH H2SO4 Sodium hydrotartrate NaHC4H4O6 HCl | Answer: А - ________; В -_________; С - ________. |
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| Answer:________________________ | | | Process accompanied rapid precipitating and in resulting contaminated a sediment (see figure), is named (answer as one word)_____________________. |