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Question

Describe your observations when potassium nitrate crystals are heated strongly in a test tube and a glowing splint is healed near the mouth of the test tube. Write a fully balanced chemical equation for the decomposition of potassium nitrate crystals.


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Solution

When potassium nitrate crystals are heated vigorously in a test tube and a lighted splint is held near the test tube's mouth, the following observations are made:

1. Potassium nitrate's white crystals slowly melt into a colourless liquid.

2. The glowing splint catches fire, showing how molten potassium nitrate emits oxygen gas.

The given reaction is:

2KNO3 2KNO2 + O2Potassium nitrate Potassium nitrite Oxygen

3. Potassium nitrate is decomposed by giving heat and produces KNO2 and O2.


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