Question

Назовите комплексные соединения, укажите степень окисления комплексообразователя и координационное число, ответьте на вопрос: в каком качестве в данных соединениях представлены элементы VIIIБ подгруппы и выполните задания: 1) напишите уравнение полной диссоциации комплексного соеди- нения; 2) напишите выражение константы нестойкости комплекс- ного иона. [Ni(H2O)6]Cl2

Answer 1

Это хлорид гексаакваникеля (2). Степень окисления комплексообразователя +2, координационное число  6, комплексообразователь - никель.
1)
[Ni(H2O)6]Cl2 = [Ni(H2O)6](2+) + 2Cl(-)
2) Кн = [Ni2+]*[H2O]^6 / [[Ni(H2O)6]Cl2]

Answer 2

Complex Compounds, Oxidation State, and Coordination Number

Complex compounds are chemical compounds in which a central metal atom or ion is surrounded by ligands. Ligands are molecules or ions that donate electrons to the central metal atom or ion, forming coordinate bonds. The coordination number of a complex compound refers to the number of coordinate bonds formed between the central metal atom or ion and the ligands.

In the given compound, [Ni(H2O)6]Cl2, the central metal atom is nickel (Ni), and the ligands are water molecules (H2O). The coordination number of this complex compound is 6, as there are six water molecules surrounding the nickel ion.

The oxidation state of the complexing agent (ligand) can be determined by considering the overall charge of the complex compound and the charge of the central metal ion. In this case, the complex compound is neutral, and the chloride ions (Cl-) have a charge of -1. Therefore, the oxidation state of the nickel ion can be calculated as follows:

2 * (-1) + 0 = -2

Since the overall charge of the complex compound is neutral, the oxidation state of the nickel ion must be +2.

Equations for Dissociation and Stability Constant

1) The equation for the complete dissociation of the complex compound [Ni(H2O)6]Cl2 can be written as follows:

[Ni(H2O)6]Cl2 ⇌ [Ni(H2O)6]2+ + 2Cl-

This equation represents the dissociation of the complex compound into the hydrated nickel(II) ion ([Ni(H2O)6]2+) and chloride ions (Cl-).

2) The expression for the stability constant (K) of a complex ion is given by the ratio of the concentration of the complex ion to the concentrations of the individual ions involved in the equilibrium. For the complex compound [Ni(H2O)6]Cl2, the stability constant expression can be written as:

K = [Ni(H2O)6]2+ / ([Ni2+] * [H2O]6 * [Cl-]2)

Here, [Ni(H2O)6]2+ represents the concentration of the hydrated nickel(II) ion, [Ni2+] represents the concentration of the nickel(II) ion, [H2O]6 represents the concentration of water molecules, and [Cl-]2 represents the concentration of chloride ions.

Please note that the specific values for the stability constant and concentrations would depend on the experimental conditions and would need to be determined through experimental measurements.

I hope this information helps! Let me know if you have any further questions.