Question

При электролизе водного раствора иодида калия на аноде образуется 1) О2 2)H2O 3)I2 4)HI

Answer 1

Ответ 3. КI=K(+)+I(-)
                H2O=H(+)+OH(-)
На катоде: Н(+)+1е=Н(0); 2Н(0)=Н2(0) в скобках-заряды)
активность ионов обратна активности атомов(см. в ряду активности металлов).Поэтому, из 2-х ионов-К(+) и Н(+)- активнее ион гидрогена и он первый разряжается на катоде. На аноде будет выделяться I2,т.к. из двух ионов ОН и І, первым будет разряжаться бескислородный ион, т.е.йод.
На аноде: I(-)-1e=I(0); 2І(0) =І2(0).

Answer 2

Electrolysis of Aqueous Potassium Iodide Solution

When an aqueous solution of potassium iodide is subjected to electrolysis, several products are formed at the anode and cathode. Let's break down the products formed at the anode and cathode.

Products Formed at the Anode:

The anode is the positive electrode where oxidation occurs. In the case of the electrolysis of an aqueous potassium iodide solution, the following products are formed at the anode:

1) O2 (oxygen gas) 2) I2 (iodine)

The formation of oxygen gas and iodine at the anode during the electrolysis of an aqueous potassium iodide solution is a result of the oxidation of water and iodide ions. The oxygen gas is produced from the oxidation of water, while iodine is produced from the oxidation of iodide ions.

The chemical reactions at the anode can be represented as follows: ``` 2I⁻(aq) → I2(s) + 2e⁻ (Reduction of Iodide ions to form Iodine) 2H2O(l) → O2(g) + 4H⁺(aq) + 4e⁻ (Oxidation of Water to form Oxygen gas) ```

Products Formed at the Cathode:

The cathode is the negative electrode where reduction occurs. In the case of the electrolysis of an aqueous potassium iodide solution, the following product is formed at the cathode:

2) H2 (hydrogen gas)

The formation of hydrogen gas at the cathode during the electrolysis of an aqueous potassium iodide solution is a result of the reduction of water.

The chemical reaction at the cathode can be represented as follows: ``` 2H2O(l) + 2e⁻ → H2(g) + 2OH⁻(aq) (Reduction of Water to form Hydrogen gas) ```

In summary, during the electrolysis of an aqueous potassium iodide solution, oxygen gas and iodine are formed at the anode, while hydrogen gas is formed at the cathode.

I hope this helps! If you have further questions, feel free to ask.