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orthocresol
orthocresol
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When can I use concentrationconcentrations instead of activityactivities in equilibrium calculations?

To calculate aan equilibrium constant, it is said that you should actually use activityactivities $a_i$ instead of concentrationconcentrations $c_i$. ItBut it is also said that inwithin a certain range, you can use concentrations instead. This is also what is usually done because it's easier.

So what is this range? When can I safely use concentrations and when should I definitely switch to using activities?

I assume in diluted enough solutions but then what is diluted enough? Will the charge of the ions have an effect on this?

When can I use concentration instead of activity?

To calculate a equilibrium constant you should actually use activity instead of concentration. It is said that in a certain range you can use concentrations instead. This is also what is usually done because it's easier.

So what is this range? When can I safely use concentrations and when should I definitely switch to using activities?

I assume in diluted enough solutions but then what is diluted enough? Will the charge of the ions have an effect on this?

When can I use concentrations instead of activities in equilibrium calculations?

To calculate an equilibrium constant, it is said that you should actually use activities $a_i$ instead of concentrations $c_i$. But it is also said that within a certain range, you can use concentrations instead. This is also what is usually done because it's easier.

So what is this range? When can I safely use concentrations and when should I definitely switch to using activities?

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edit approved Dec 30, 2016 at 4:43
Nij
edit approved Dec 30, 2016 at 4:43
Nij
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To calculate a equilibrium constant you should actually use activity instead of concentration. It is said that in a certain range you can use concentrations instead. This is also what is usually done because it's easier.

So what is this range? whenWhen can I safely use concentrations and when should I definitely switch to using activities?

I assume in diluted enough solutions but then what is diluted enough? and willWill the charge of the ions have an effect on this?

Have searched the internet a bit but can't really find an answer.

Thanks in advance

To calculate a equilibrium constant you should actually use activity instead of concentration. It is said that in a certain range you can use concentrations instead. This is also what is usually done because it's easier.

So what is this range? when can I safely use concentrations and when should I definitely switch to using activities?

I assume in diluted enough solutions but then what is diluted enough? and will the charge of the ions have an effect on this?

Have searched the internet a bit but can't really find an answer.

Thanks in advance

To calculate a equilibrium constant you should actually use activity instead of concentration. It is said that in a certain range you can use concentrations instead. This is also what is usually done because it's easier.

So what is this range? When can I safely use concentrations and when should I definitely switch to using activities?

I assume in diluted enough solutions but then what is diluted enough? Will the charge of the ions have an effect on this?

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stef
stef
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When can I use concentration instead of activity?

To calculate a equilibrium constant you should actually use activity instead of concentration. It is said that in a certain range you can use concentrations instead. This is also what is usually done because it's easier.

So what is this range? when can I safely use concentrations and when should I definitely switch to using activities?

I assume in diluted enough solutions but then what is diluted enough? and will the charge of the ions have an effect on this?

Have searched the internet a bit but can't really find an answer.

Thanks in advance