Here's how it works:
1. Catalyst: MnO₂ acts as a catalyst, speeding up the chemical reaction without being consumed in the process.
2. Lowering Activation Energy: It lowers the activation energy required for the decomposition of potassium chlorate. This means the reaction happens faster and at a lower temperature.
3. Decomposition Reaction: The presence of MnO₂ allows the decomposition of potassium chlorate to occur at a temperature lower than the decomposition temperature of potassium chlorate alone. The reaction proceeds as follows:
2KClO₃ (s) → 2KCl (s) + 3O₂ (g)
Without MnO₂, the decomposition of KClO₃ would require a much higher temperature, making the process less efficient and potentially dangerous.
In summary, manganese dioxide acts as a catalyst, enabling the decomposition of potassium chlorate into potassium chloride and oxygen gas at a lower temperature.
