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25. Calculate pH of buffer solution, contained 0,1 mol CH₃COOH and 1 mol CH₃COONa in 1 L (pK_acid =4,75).

Solution: _________________________________________________________________________

_________________________________________________________________________________

Answer:_________________

26. Calculate Redox potential of solution, contained 0,01 N К₂CrO₄ and 0,01 N CrCl₃ per 1 L at рН=3 (E_o = + 1,33 V).

Solution: _________________________________________________________________________

_________________________________________________________________________________

Answer:_________________

27. Calculate dissociation degree α of 0,01 N NH₄OH (K_dis=1,7610^-5)

Solution:___________________________________________________

Answer:__ α =______

28. Equivalent mass of Cu²⁺ (A=63,55 g/mol) cation for iodometric determination is:

1	63,55 g-eq/g;	Answer:_____________
2	31,78 g-eq/g;
3	16,71 g-eq/g;
4	13,75 g-eq/g;
5	125,10 g-eq/g.

29. Note ionic and coordinative bonds in the complex of EDTA and metal ion:

OOC -	C H₂		CH₂	-COONa
		N -CH₂-CH₂-N
NaCOO-	C H₂		CH₂	- COO

30. Calculate concentration of solution, contained 0,006 g of solute in 100 g of solution.

1	6 ppm;	Answer:_____________
2	0,6 ppm;
3	60 ppm;
4	600 ppm;
5	0,006 ppm.

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. )

«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 № 4

1. Put in the sentence a missing words:

Analytical chemistry includes two parts: _________________________ and __________________ analyses.

2. Note specific qualitative reagent of Mn²⁺cations is:

1	Sodium Bismuthate NaBiO₃ in nitrate acid medium	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)

Specific Selective

Group

(NH₄)₂HPO₄

Potassium hexanitritocobaltate (III) Na₃[Co(NO₂)₆]

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:

Electrical balance

Dessicator

Convection drier

Centrifuge

1 2 3 4

Answer: А - ____; В -____; С - ____; D - ____, E -____.

5. Calculate equivalent mass of K₂CrO₄ (M=194,20 g/mol) for RedOx titration in acidic medium:

1	194,20 g/g-eq;	Answer:____________________
2	97,10 g/g-eq;
3	64,73 g/g-eq;
4	32,37 g/g-eq.

6. To propose the reagent for the separation of cations:

K⁺, Na⁺

^↓

Added Reactant____________________

Solution:_______ Cation

Sediment:_______ (chemical formula)

7. Determine correspondence of titration methods and their secondary standards (working solutions).

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

1	Sodium Bismuthate NaBiO₃Zinc-Uranyl-Acetate	Answer:___________________
2	Potassium ferrocyanide K₃[Fe(CN)₆]
3	Potassium ferricyanide K₄ [Fe(CN)₆]
4	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:

1	Quantity of soluble substance in equivalents per 1 000 L of solution;	Answer:______
2	Quantity of soluble substance in grams per 1 000 grams of solution;
3	Quantity of soluble substance in grams per 1 000 000 grams of solution;
4	Quantity of soluble substance in mol per 100 g of solution.

13. Note the most sensitive reactions for the next cations:

NH₄⁺

Na⁺

K⁺

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:

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.

17. Red-Ox potential of system CrO₄^2-/Cr³⁺ in acidic medium at pH=1 and concentrations of [CrO₄^2-]=0,1 M; [Cr³⁺]=0,01 M is (E⁰ = +1,36 V):

1	+ 1,456 V;	Answer:____________
2	+ 1,222 V;
3	+ 1,486 V;
4	+ 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) :

1	ZnSe (SP=1·10^-31)	Answer:____________
2	ZnCO₃ (SP=1,45·10^-11)
3	ZnS (SP=2·10^-25)
4	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):

1	6,0497 g/mL;	Answer:_____________
2	0,3490 g/mL;
3	0,1653 g/mL;
4	0,1790 g/mL.

25. Calculate pH of buffer solution, contained 1 mol CH₃COOH and 0,01 mol CH₃COONa in 1 L (pK_acid =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 (E_o = + 1,33 V).

Solution: _________________________________________________________________________

_________________________________________________________________________________

Answer:_________________

27. Indicators of complexonometry are:

1	Weak organic bases and bases;	Answer:_____________
2	Strong organic acids;
3	Red-Ox systems;
4	Weak ligands, formed color compexes with metal cations.

28. Equivalent mass of H₃PO₄ (A=98,00 g/mol) for neutralization method:

1	98,00 g-eq/g;	Answer:_____________
2	49,00 g-eq/g;
3	32,67 g-eq/g;
4	13,75 g-eq/g;
5	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-____________.

0,1 N hydrochloric acid HCl

by 0,1 N Sodium hydroxide NaOH (pH_eq=7,00)

0,1 N acetic acid CH₃COOH

by 0,1 N Sodium hydroxide NaOH (pH_eq=8,87)

0,1 N hydrochloric acid HCl

by 0,1 N Ammonium hydroxide NH₄OH (pH_eq=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. )

«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 № 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:

1	NH₄SCN in acetone	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)

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 - ________.

4. Process accompanied rapid precipitating and in resulting contaminated a sediment (see figure), is named (answer as one word)_____________________.

5. Calculate equivalent mass of KMnO₄ (M=158 g/mol) for RedOx titration in acidic medium:

1	31,6 g/g-eq	Answer:____________________
2	79,0 g/g-eq
3	52,7 g/g-eq
4	158 g/g-eq

6. To propose the reagent for the separation of cations:

Mg²⁺, Pb²⁺

^↓

Added Reactant____________________

Solution:_______ Cation

Sediment:_______ (chemical formula)

7. Determine correspondence of titration methods and their indicators:

Neutralization Complexonometry

Iodometry

Permanganatometry

Diphenylammine

Litmus

Starch

Eriochrome black T

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 0,1 M K₂SO₃ in 1 L.

1.	0,50	Answer:____________________
2.	0,30
3.	0,10
4.	0,09

10. Note relative specific reagent of Fe³⁺ cation

1	Sodium Bismuthate NaBiO₃Zinc-Uranyl-Acetate	Answer:___________________
2	Potassium ferrocyanide K₃[Fe(CN)₆]
3	Potassium ferricyanide K₄ [Fe(CN)₆]
4	Ammonium Hydrophosphate (NH₄)₂HPO₄.

11. To propose the buffer mixture, using proposed reactants (possible more than one true variant)

NH₂Cl, Na₂HPO₄; NaH₂PO₄

Answer:_____________________________________________________________________________

NH₂OH; KOH

HCl, H₃PO₄

12. Titr concentration is shown:

1	Quantity of soluble substance in grams per 1 L of solution;	Answer:______
2	Quantity of soluble substance in grams per 1 grams of solution;
3	Quantity of soluble substance in grams per 1 mL of solution;
4	Quantity of soluble substance in mol per 100 mL of solution.

13. Apparatus, presented at picture, is used for identification of anions:

Answer:___________________

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