Sodium hydroxide or potassium hydroxide, whose alkalinity is stronger? The alkalinity of potassium hydroxide is stronger than that of sodium hydroxide. But this requires a prerequisite, as the alkalinity of the base is related to the degree of ionization of the base. For both sodium hydroxide and potassium hydroxide, which are fully ionized strong bases, metal activity can be used to determine, that is, the more active the metal, the stronger the alkalinity of the corresponding hydroxide.
Simply put, a solvent that can distinguish the strength of the acidity and alkalinity of two substances is called a distinguishing solvent, otherwise it is called a leveling solvent. The sodium hydroxide and potassium hydroxide mentioned in the title will be completely ionized when dissolved in water at the same time, which means that both are flattened by the solvent water and exhibit the same alkalinity. If ethanol or liquid ammonia are used as solvents, the alkalinity of the two can be distinguished.
The concepts of the alkalinity of an alkali and the alkalinity of a solution are different. It should be a comparison of the alkalinity of the alkali. The alkalinity of a base is related to the degree of ionization of the base. For two completely ionized strong bases, sodium hydroxide and potassium hydroxide, the metal activity is used to determine the alkalinity. From this perspective, potassium hydroxide is more alkaline than sodium hydroxide.
The alkalinity of a solution is determined by the concentration of hydroxide ions. The higher the concentration of hydroxide ions, the stronger the alkalinity. Sodium hydroxide solutions with the same molar concentration have the same alkalinity as potassium hydroxide solutions.
Potassium hydroxide is electrolyzed using an aqueous solution of potassium chloride, while sodium hydroxide is electrolyzed using an aqueous solution of sodium chloride. The only difference between the two is that the raw materials are different (one is KCl and the other is NaCl), and the products are different (one is KOH and the other is NaOH). The same is that both require processes such as brine refining and electrolysis, and the structure of the electrolytic cell is basically the same. Of course, many details are definitely different.
The molar mass of potassium hydroxide is greater than the molar mass of sodium hydroxide;
When the concentration of both substances is the same, the alkalinity of the solution is the same;
When the mass fraction of both solutions is the same, the alkalinity of sodium hydroxide solution is greater than that of potassium hydroxide solution;
The price of potassium hydroxide is higher than that of sodium hydroxide, but when configuring the same alkaline solution, the quality of potassium hydroxide needs to be higher.
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