Potassium reacts very rapidly with water to produce a colourless solution of potassium hydroxide and hydrogen gas.
Understanding the Reaction
When potassium metal (K) comes into contact with water (H₂O), a chemical reaction occurs that is notably vigorous and fast. Based on the provided information:
- Potassium reacts very rapidly with water.
- The reaction forms two main products:
- Potassium hydroxide (KOH): This dissolves in the water, creating a solution.
- Hydrogen gas (H₂): This is released as a gas.
The chemical equation representing this reaction is typically written as:
2K(s) + 2H₂O(l) → 2KOH(aq) + H₂(g)
Where (s) denotes solid, (l) denotes liquid, (aq) denotes aqueous solution, and (g) denotes gas.
Properties of the Products
The reference highlights key characteristics of the reaction and its products:
- Potassium Hydroxide (KOH): Forms a colourless solution. The dissolved hydroxide ions (OH⁻) make the resulting solution basic.
- Hydrogen Gas (H₂): Released during the reaction.
- Nature of the Reaction: The reaction is described as exothermic, meaning it releases heat. This is why reactions between alkali metals like potassium and water can be particularly energetic and even explosive, as the heat generated can ignite the hydrogen gas produced.
In summary, the interaction of potassium with water is a swift and energetic process yielding a basic solution and hydrogen gas, accompanied by the release of heat.
