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# Buffer question watch

1. Lets say we have a buffer mixture of ethanoic acid and sodium ethanoate.

I know adding another acid(ie HCl) would increase the concentration of ethanoic acid and decrease the concentration of ethanoate ions.

But what if more ethanoic acid is added to the buffer mixture? Considering the anions of this acid will also affect the equilibrium of the buffer, would the ethanoate ion concentration still decrease? I know the ethanoic acid concentration has to increase, but I'm still lost about the ethanoate ions.

I also have a second question. Can you consider 1/time(in seconds) to be the same as the rate of reaction?

2. Adding EtOOH would move the equilibrium to the RHS, increasing [H+] (therefore reducing the pH a bit) and also increasing [Et-] (every H+ formed must also form an Et-).

1/t = rate, only for reactions in which you have a constant change in something, e.g. a clock reaction. Better to say rate is proportional to 1/t.
3. (Original post by Trainz)
Lets say we have a buffer mixture of ethanoic acid and sodium ethanoate.

I know adding another acid(ie HCl) would increase the concentration of ethanoic acid and decrease the concentration of ethanoate ions.

But what if more ethanoic acid is added to the buffer mixture? Considering the anions of this acid will also affect the equilibrium of the buffer, would the ethanoate ion concentration still decrease? I know the ethanoic acid concentration has to increase, but I'm still lost about the ethanoate ions.

I also have a second question. Can you consider 1/time(in seconds) to be the same as the rate of reaction?

The units of rate is determined by the order of the reaction, only if it's zero order will it be 1/t

4. (Original post by langlitz)
The units of rate is determined by the order of the reaction, only if it's zero order will it be 1/t
First order!
5. (Original post by Pigster)
First order!
Actually, after checking my notes, we're both wrong. The units of rate are always .
It's the units of the rate constant, k, which are determined by the order
6. What are the units for rate in the disappearing clock reaction, where you don't know n?

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