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during lecture 2, Professor Lavelle said that if Q<K during a reaction, then [R]>[P] and the forward reaction is favored. however, isn't it possible for Q<K but for [P] to be greater than [R]?
Hi Lucy! My understanding is that if [P] is greater than [R], then that means products are added to the equilibrium mixture and so Q temporarily rises above K since products appear in the numerator. So I think Q would no longer be less than K. Section 5J in the book talks about this a bit, you may be able to find an answer there too :)
Fancy seeing you here. I believe that it's not possible for Q to be smaller than K while [P] is greater than [R], because Q is equal to [P]/[R]. Meaning that when [P] is greater than [R], Q is going to be some number over 1, whereas K would be 1, as [P]=[Q] for K.
Could someone list what terms are used when talking about Q? I get a bit confused on which terms are used for K or Q
In the second scenario you mention, for [P] being greater than [R], this would mean that the condition Q<K is no longer true, and the reverse reaction would be favored. Hope this helps!
Ellison Gonzales 1H wrote:Could someone list what terms are used when talking about Q? I get a bit confused on which terms are used for K or Q
K is the equilibrium constant, while Q is the reaction quotient.
Q = [P] / [R], so if Q<K, there is no way that the reactant concentration could be greater than the products and Q be <K.
Q=[P]/[R], K=[P]/[R] so if Q<K this has to mean there was an increase in reactant from equilibrium concentration, the reactant concentration has to be greater than the product concentration, meaning the forward reaction is favored as Lavelle said. K=1 when [P]=[R] so if [P] is greater than [R] it is no longer true Q<K.
Actually, when Q<K it is always the case that the reaction is a forward reaction since more products are formed than reactants, so [P] is always greater than [R]. I don't get where you got the info that [R]> [P] when Q<K since [R] is decreasing. In the questions having to do with Le Chatelier's principle and the adding or removing of reactants and products, Q can decrease to be less than K if we were to either remove reactants or add a product which is kind of the same thing.
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