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)		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:

	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.

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:

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

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

OOC -	CH2		CH2	-COONa
		N-CH2-CH2-N
NaCOO-	CH2		CH2	-COO

Me

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

	6 ppm;	Answer:_____________
	0,6 ppm;
	60 ppm;
	600 ppm;
	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.)

«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 № 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:

	Sodium Bismuthate NaBiO3 in nitrate acid medium	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] 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.

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:

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

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

	K^+, Na^+ Added Reactant____________________ ^↓
Solution:_______ Cation		Sediment:_______ (chemical formula)

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