What is the need to heat solution?
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If the temperature is too low (below $55$ degrees celsius), the interaction between the oxalate and the potassium permanganate will move too slow as to be used as a practical lab experiment.
Above $60$ degrees celsius, oxalate acid begins to decompose, so its important to stay in this range.
Above $60$ degrees celsius, oxalate acid begins to decompose, so its important to stay in this range.
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