Discussion
What is a mixture of potassium nitrate powdered charcoal and sulphur called?
Answer: C
The mixture is gunpowder.
The classic proportions are about 75 per cent potassium nitrate, 15 per cent charcoal and 10 per cent sulphur. The nitrate supplies oxygen, the charcoal is the fuel and the sulphur lowers the ignition temperature: \[\mathrm{2KNO_3 + 3C + S \rightarrow K_2S + N_2 + 3CO_2}\]
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