FINAL_TESTS_2010
.doc
6. To note correspondence of anions and their group reagents:
A. B. C.
|
The 1st group The 2d group The 3d group
|
1 2 3 4 5 6 |
SO32- Br- PO43- MoO42- CH3COO- Cl- |
Answer: А - ________;
В -________;
С - ________. |
7. To propose the reagent for the separation of cations:
|
Al3+, Mg2+ ↓ |
Added
Reactant____________________ |
Solution:_______ Cation |
|
Sediment:_______ (chemical formula) |
8. Determine correspondence of titration methods and their secondary standards (working solutions).
A B C D |
Iodometry Permanganatometry Complexonometry Neutralization |
1 2 3 4 |
Na2S2O3 (Sodium Thyosulfate) HCl (Hydrochloric acid) KMnO4 (potassium permanganate) Na2EDTA (trilon B) |
Answer: А - _______; В - _______; С - _______; D - _______. |
9. This figure demonstrates the curve of titration of _______ (weak or strong) _________ (acid or base) by _________ (weak or strong)____________ (acid or base).
10. Calculate ionic power µ (or I) of solution, contained 0,01 M Na2SO4 in 1 L.
1. |
0,05 |
Answer:____________________ |
2. |
0,03 |
|
3. |
0,01 |
|
4. |
0,30 |
11. Note relative specific reagent of Na+ cation
1 |
Dimethylgloxime (Chugaev’s reagent) C4H8N2O2 |
Answer:___________________ |
2 |
Potassium hexahydroxostibiate (V) K[Sb(OH)6] |
|
3 |
Zinc-Uranyl-Acetate Zn(UO2)3(CH3COO)8 in presence of acetic acid CH3COOH |
|
4 |
Ammonium Hydrophosphate (NH4)2HPO4. |
12. To propose the buffer mixture, using proposed reactants (possible more than one true variant)
1 |
H2SO4, CH3COOH |
Answer:___________________________________
__________________________________________ |
2 |
NH4OH, NaOH |
|
3 |
NH4Cl, NaHCO3; Na2CO3; CH3COONa |
13. Molar concentration is shown:
1 |
Quantity of soluble substance in equivalents per 1 L of solution; |
Answer:_____________ |
2 |
Quantity of soluble substance in mol per 1 L of solution; |
|
3 |
Quantity of soluble substance in mol per 1 kg of solution; |
|
4 |
Quantity of soluble substance in mol per 100 g of solution. |
14. What sensitivity index of the qualitative analytical reaction expresses as 1:1 000 000 :
1 |
Minimum concentration; |
Answer:_____________ |
2 |
Detectable minimum; |
|
3 |
Maximum dilution. |
15. To note homogeneous systems, formed at mixing of solutions by pairs (possible more than one true variant):
FeSO4; Na2EDTA; H3PO4
Answer:________- _____; ______-______.
16. To write reaction of Fe3+ Sulfate and “yellow blood salt” in molecular form and to calculate the sum of coefficients in this reaction (remember, that absence of coefficient before formula means figure 1):
__ __________ + ___ ____________ → _____________________ + __ ______________
Sum of coefficients: ______
17. Calculate pH of 0,1 N H2CO3 (pK1=6,5; pK2=10,22)
1 |
3,48; |
pH (weak acid)=_________________________________
Answer:____________ |
2 |
5,68; |
|
3 |
2,12; |
|
4 |
3,75. |
18. Write formulas of temporary hardness salts – cause of scale formation
Cause of scale?
Answer: Formulas of dissolved salts in fresh water:________________________
19. When the sample of impure potassium chloride KCl (0,4500 g) was dissolved in water and treated with excess of Silver Nitrate, 0,8402 g of AgCl (M=143,22 g/mol) was precipitated. Calculate the percentage content of KCl (M=74,55 g/mol) in the original sample.
Solution:_________________________________________________________________________
_________________________________________________________________________________
_________________________________________________________________________________
Answer:_________
20. Calculate solubility (in mol/L and g/L) of BiPO4 (SP= 1,3∙10-23, M(BiPO4)= 303,95 g/mol) in the solution of ionic power 0,01 M (activity coefficients – see Appendix).
Solution:_________________________________________________________________________
_________________________________________________________________________________
_________________________________________________________________________________ Answer:_________ |
21. Calculate mass of Al2(SO4)3∙18H2O (M=666,42 g/mol) for gravimetric analysis in the form of AlPO4 (M = 121,95 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 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) |
1 2 3 4 5 6 7 8 |
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)
|
23. Calculate pH of 0,01 N H3PO4 (pK1=1,96; pK2=6,70; pK3=12,44).
1 |
3,38; |
Answer: _________________ |
2 |
4,33; |
|
3 |
9,57; |
|
4 |
1,98. |
24. It is necessary for preparation of coarse-crystalline sediment:
1 |
To precipitate of hot concentrated solutions; |
Answer:_____________ |
2 |
To precipitate of cold diluted solutions; |
|
3 |
To precipitate of hot diluted solutions; |
|
4 |
To precipitate of cold concentrated solutions. |
25. Calculate pH of buffer solution, contained 0,1 mol NH3 and 1 mol NH4Cl in 1 L (pK (NH3)=9,24).
Solution: _________________________________________________________________________
_________________________________________________________________________________
Answer:_________________ |
26. Calculate Redox potential of solution, contained 0,1 N КMnO4 and 0,001 N MnSO4 per 1 L at рН=2 (Eo = + 1,51 V).
Solution: _________________________________________________________________________
_________________________________________________________________________________
Answer:_________________ |
27. Calculate dissociation degree α of 0,01 N H3BO3 (K 1 dis=5,810-10)
Solution:___________________________________________________
Answer:__ α =______
28. Equivalent mass of Ce3+ (A=140,12 g/mol) cation in reaction with Trilon B is:
1 |
140,12 g-eq/g; |
Answer:_____________ |
2 |
70,06 g-eq/g; |
|
3 |
46,71 g-eq/g; |
|
4 |
16,75 g-eq/g; |
|
5 |
53,96 g-eq/g. |
29. Note functional atoms in the formula of Trilon B
HCOO- |
C H2 |
|
CH2 |
- COONa |
|
|
___-CH2-CH2-___ |
|
|
NaCOO- |
C H2 |
|
CH2 |
- COOH |
30. Calculate concentration of solution, contained 0,001 g of solute in 1000 g of solution.
1 |
1 ppm; |
Answer:_____________ |
2 |
0,1 ppm; |
|
3 |
10 ppm; |
|
4 |
100 ppm; |
|
5 |
0,001 ppm. |
НАЦІОНАЛЬНИЙ УНІВЕРСИТЕТ БІОРЕСУРСІВ ТА ПРИРОДОКОРИСТУВАННЯ УКРАЇНИ
Факультет Екології і біотехнології
Напрям підготовки (спеціальнісsть) 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. )
«09» 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 № 3
1. Put in the sentence a missing words:
A buffer solution is an aqueous solution consisting of a mixture of a _______ acid and its salt of strong base or ___________________ base and its salt of strong acid.
|
2. Note specific qualitative reagent of Ni2+ cations is:
1 |
NH3 (concentrated) in excess |
Answer:______________________ |
2 |
Yellow blood salt K4[Fe(CN)6] |
|
3 |
Red blood salt K3[Fe(CN)6] |
|
4 |
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
|
1 2 3 4
5 6 |
(NH4)2HPO4 NaOH H2SO4 Nessler’s reagent K2[HgI4]+KOH NaBiO3 + HNO3 (diluted) HCl |
Answer: А - ________; С - ________;
В -_________; D - ________. |
4. To point the correspondence of names of analytical glassware:
A. B. C. D. E.
|
Spatula Crucible Watch glass Funnel Measuring flask
|
1 2 3 4 5 |
Answer: А - ____; В -____; С - ____; D - ____, E -____.
5. To note correspondence of anions and their group reagents:
A. B. C.
|
The 3d group The 2d group The 1st group
|
1 2 3 4 5 6 |
SO42- SO32- NO3- CH3COO- MoO4- Cl- |
Answer: А - ________; В -________; С - ________. |
6. To propose the reagent for the separation of cations:
|
C
Added
Reactant____________________ ↓ |
|
Solution:_______ Cation |
|
Sediment:_______ (chemical formula) |
7. Determine correspondence of titration methods and their standard substances.
A B C D |
Iodometry Permanganatometry Complexonometry Neutralization |
1 2 3 4 |
H2C2O4 (oxalic acid) KMnO4 (potassium permanganate) Na2B4O7 (borax) ZnSO4 or Zn (metallic) |
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 0,05 M NaHCO3 in 1 L.
1. |
0,05 |
Answer:____________________ |
2. |
0,03 |
|
3. |
0,01 |
|
4. |
0,30 |
10. Note relative specific reagent of Mn2+ cation
1 |
Zinc-Uranyl-Acetate Zn(UO2)3(CH3COO)8 in presence of acetic acid CH3COOH |
Answer:___________________ |
2 |
Sodium Bismuthate NaBiO3 |
|
3 |
Potassium hexahydroxostibiate (V) K[Sb(OH)6] |
|
4 |
Ammonium Hydrophosphate (NH4)2HPO4. |
11. To propose the buffer mixture, using proposed reactants (possible more than one true variant)
1 |
NH4Cl, Na3BO3 |
Answer:___________________________________
__________________________________________ |
2 |
NH4OH, KOH |
|
3 |
H3BO3, CH3COOH |
12. Mass concentration (percent concentration) is shown:
1 |
Quantity of soluble substance in equivalents per 1 L of solution; |
Answer:____________ |
2 |
Quantity of soluble substance in mol per 1 L of solution; |
|
3 |
Quantity of soluble substance in grams per 100 grams of solution; |
|
4 |
Quantity of soluble substance in mol per 100 g of solution. |
13. What sensitivity index of the qualitative analytical reaction expresses as 10ɣ :
1 |
Minimum concentration; |
Answer:_____________ |
2 |
Maximum dilution; |
|
3 |
Detectable minimum. |
14. To note homogeneous systems, formed at mixing of solutions by pairs (possible more than one true variant):
NH4OH; HCl; H2SO4; FeCl2
Answer:________- _____; ______-______; _____-_____.
15. Note the name of this phenomenon
← ?
Answer:_________________
16. To write reaction of Co3+ Chloride and 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: ______
17. Calculate pH of 1 N NH4OH (pK=4,75):
1. |
11,65; |
Answer:____________________ |
2. |
8,79; |
|
3. |
10,12; |
|
4. |
7,00. |
18. Calculate absolute and relative errors of analysis at such data:
Experimental results of Fe content in More’s salt: 14,56%;
Expert analysis data (true result) - 14,78%.
Solution:___________________________________________________________________________
___________________________________________________________________________________
Answer:________________________
19. How many percent of iron is contained in the sample by mass 0,28 g, if after its dissolving in sulfate acid H2SO4 in oxygen-free atmosphere for titration of obtained solution was used 49,7 mL 0,0897 N KMnO4.
Solution:_________________________________________________________________________
_________________________________________________________________________________
_________________________________________________________________________________
Answer:_________
20. Calculate solubility (in mol/L and g/L) of BaSO4 (SP= 1·10-10, M(BaSO4)= 233,40 g/mol) in the solution of ionic power 0,05 M (activity coefficients – see Appendix).
Solution:_________________________________________________________________________
_________________________________________________________________________________
_________________________________________________________________________________ Answer:_________ |
21. Calculate mass of NiSO4∙7H2O (M=280,89 g/mol) for gravimetric analysis in the form of Ni(OH)2 (M = 92,73 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 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) |
1 2 3 4 5 6 7 8 |
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)
|
23. Calculate pH of 0,01 N Na2CO3 (pK1 (H2CO3) =6,35; pK2(H2CO3) =10,33).
Solution: _________________________________________________________________________
_______________________________________________________________________________
Answer: ___________
24. It is necessary for preparation of amorphous sediment:
1 |
To precipitate of hot concentrated solutions; |
Answer:_____________ |
2 |
To precipitate of cold diluted solutions; |
|
3 |
To precipitate of hot diluted solutions; |
|
4 |
To precipitate of cold concentrated solutions. |