Question

ПОМОГИТЕ ПОЖАЛУЙСТААА))))...Почему калий нельзя получить электролизом водных растворов солей?Ответ поясните с помощью уравнений реакций.Как можно получит калий с помощью электролиза ?

Answer 1

2KCl+2H2O=2KOH+H2+Cl2 поскольку калий активный металл, то в водных растворах образует щелочь ( К получится не может). Получают электролизом расплавов солей.
2KCl=2K+Cl2

Answer 2

Why Potassium Cannot Be Obtained by Electrolysis of Aqueous Solutions of Salts

Potassium cannot be obtained by electrolysis of aqueous solutions of salts due to the high reactivity of potassium metal. When an aqueous solution of a salt is electrolyzed, water is typically the substance that is electrolyzed, not the salt itself. The electrolysis of water produces hydrogen gas at the cathode and oxygen gas at the anode. However, in the case of potassium, the high reactivity of the metal causes it to react with water or hydroxide ions, making it unsuitable for electrolysis in aqueous solutions.

The reaction of potassium with water can be represented by the following equation: 2K(s) + 2H2O(l) → 2KOH(aq) + H2(g)

This reaction shows that potassium reacts with water to form potassium hydroxide and hydrogen gas. Therefore, when attempting to electrolyze an aqueous solution containing potassium ions, the potassium metal would react with the water, leading to the formation of potassium hydroxide and hydrogen gas rather than the deposition of metallic potassium at the cathode.

How to Obtain Potassium Using Electrolysis

Potassium can be obtained by the electrolysis of molten potassium chloride (KCl). In this process, the electrolysis of molten potassium chloride results in the production of potassium metal at the cathode and chlorine gas at the anode.

The overall reaction for the electrolysis of molten potassium chloride can be represented by the following equation: 2KCl(l) → 2K(s) + Cl2(g)

This reaction demonstrates that the electrolysis of molten potassium chloride leads to the formation of potassium metal and chlorine gas. Unlike the electrolysis of aqueous solutions of salts, the electrolysis of molten potassium chloride allows for the direct production of potassium metal without the interference of water or hydroxide ions.

Therefore, while potassium cannot be obtained by electrolysis of aqueous solutions of salts due to its reactivity with water, it can be obtained through the electrolysis of molten potassium chloride, which allows for the direct production of potassium metal.

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