Chemistry a level help/question.

Hi, I'm doing about clock reactions in a level chemistry and one of the assumptions is the concentration of the reactant doesnt vary significantly over the time. I'm a bit unsure of what this means, any help would be greatly appreciated

Reply 1

TypicalNerd

Original post by emmajonesss

My guess is that one of your reagents used is a limiting reagent with the other reagents in a huge excess compared to it.

Because the other reagents will be in a huge excess compared to the limiting reagent, as the reaction progresses, very little of these reagents will react overall and their concentrations will be almost constant throughout. Thus that will mean they have little effect on the rate throughout.