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    why does it take longer in a light dependent reaction far a plant in NH3OH to change colour rather than water.

    is this something to do with photlysis.
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    Assuming by the question, this should mean water is a better source of protons and electrons for photosynthesis. I'm not sure what you mean by colour change though, explain please
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    Could it be that H20 fully dissociates giving up 2 protons and 2 electrons, whilst NH3OH only gives up 1 of each to give NH3O+, H+ and e-.
 
 
 
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