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:

	31,6 g/g-eq	Answer:____________________
	79,0 g/g-eq
	52,7 g/g-eq
	158 g/g-eq

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

	Mg^2+, Pb^2+ ^↓	Added Reactant____________________
Solution:_______ Cation		Sediment:_______ (chemical formula)

7. Determine correspondence of titration methods and their indicators:

A B C D

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

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

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

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

Answer:___________________

15. 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: ______

16. Calculate gravimetric factor f for determination of Ca²⁺ content in CaCl₂·6H₂O (M=219,08 g/mol) in the form of precipitate Ca₂P₂O₇ (M=254,10 g/mol):

	1,7380;	Answer:___________________
	0,8622;
	1,1599;
	0,5799.

17. What is dentation of Tetrasodium EDTA:

	Mono dental;	Answer:___________________
	Bi dental;
	Tri dental;
	Tetra dental.

18. Calculate mass of H₃PO₄ (M=98,00 g/mol), dissolved in 500 mL of solution, if for titration of 10 mL of this acid it was used 10 mL of 0,01 N NaOH):

Solution: _________________________________________________________________________

_________________________________________________________________________________

Answer:_________________

19. Calculate solubility (in g/L) of Fe(OH)₃ at pH=4 (SP=4·10^-38; M=98,22 g/mol)

Solution: _________________________________________________________________________

_________________________________________________________________________________

Дата добавления: 2015-11-16