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

The following observations are made when potassium nitrate crystals are heated strongly in a test tube and a glowing splints is held near the mouth of test tube:

1. The white crystals of potassium nitrate slowly melt to form a colourless liquid.

2. The glowing splint bursts into flame, showing that molten potassium nitrate gives off oxygen gas.

$2 K N O_{3}$ $H e a t - -- \to$ $2 K N O_{3}$ + $O_{2}$
Potassium nitrate Potassium nitrate Oxygen

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