Why does a potential energy diagram showing the effect of a catalyst on activation energy not move left on the reaction pathway scale (compared to uncatalysed reaction) if a catalyst speeds up reactions?
closed as unclear what you're asking by Mithoron, Todd Minehardt, andselisk♦, airhuff, Geoff Hutchison Dec 29 '17 at 23:39
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Because the reaction coordinate does not indicate speed. It represents a certain state of the reaction (e.g. 50 % completed) but it does not have any information about time in it.
Therefore the higher reaction speed is not represented in those diagrams.