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 Answer: Formulas of dissolved salts in fresh water:________________________ 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 Answer: Formulas of dissolved salts in fresh water:________________________ 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 (Eo = + 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 Answer: Formulas of dissolved salts in fresh water:________________________ 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. )

«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 Answer: Formulas of dissolved salts in fresh water:________________________ 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[HgI Answer: Formulas of dissolved salts in fresh water:________________________4]+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 SO42- SO32- NO3- CH3COO- MoO4- Cl- Answer: А - ________; В -________; С - ________.

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

Added Reactant____________________
Cu2+, Mn2+


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Документ Answer: Formulas of dissolved salts in fresh water:________________________