* Sodium hydroxide is more soluble in water than potassium hydroxide. This means that it can dissolve more readily in water to form a more concentrated solution.

* Sodium hydroxide is more caustic than potassium hydroxide. This means that it can cause more severe burns to the skin and eyes.

* Potassium hydroxide is a stronger base than sodium hydroxide. This means that it can more readily accept protons from other molecules.

Here is a table summarizing the key differences between sodium hydroxide and potassium hydroxide:

| Property | Sodium hydroxide | Potassium hydroxide |

|---|---|---|

| Solubility in water | More soluble | Less soluble |

| Causticity | More caustic | Less caustic |

| Strength of base | Weaker | Stronger |

Note: Sodium hydroxide and potassium hydroxide are both hazardous chemicals and should be handled with care.