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Oxygen: Potassium Chlorate Heated with Manganese Dioxide at about 240 °C
The convenient laboratory way, from Thorpe's Dictionary (1913): potassium chlorate mixed with about an eighth of its weight of manganese dioxide gives off oxygen steadily at about 240 °C, well below its melting point. 100 parts of chlorate give 39.16 parts of oxygen. Test the dioxide first: pyrolusite adulterated with coal dust has exploded with chlorate and killed. Face shield.
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