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)		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).

	3,38;	Answer: _________________
	4,33;
	9,57;
	1,98.

24. It is necessary for preparation of coarse-crystalline 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 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 (E_o = + 1,51 V).

Solution: _________________________________________________________________________   _________________________________________________________________________________   Answer:_________________

27. Calculate dissociation degree α of 0,01 N H₃BO₃ (K _{1 dis}=5,8×10^-10)

Solution:___________________________________________________

Answer:__ α =______

28. Equivalent mass of Ce³⁺ (A=140,12 g/mol) cation in reaction with Trilon B is:

	140,12 g-eq/g;	Answer:_____________
	70,06 g-eq/g;
	46,71 g-eq/g;
	16,75 g-eq/g;
	53,96 g-eq/g.

29. Note functional atoms in the formula of Trilon B

HCOO-	CH2		CH2	- COONa
		___-CH2-CH2-___
NaCOO-	CH2		CH2	- COOH

30. Calculate concentration of solution, contained 0,001 g of solute in 1000 g of solution.

	1 ppm;	Answer:_____________
	0,1 ppm;
	10 ppm;
	100 ppm;
	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.)

«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 № 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:

	NH3 (concentrated) in excess	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 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 3^d group The 2^d group The 1^st group

SO4^2- SO3^2- NO3^- CH3COO^- MoO4^- Cl^-

Answer: А - ________; В -________; С - ________.

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

Added Reactant____________________ Cu^2+, Mn^2+ ^↓

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