[lattywatty]

What on earth is the difference? In my revision guide I got:

"The system reaches equilibrium. All the reactants and products are present in the equilibrium mixture. The amounts of the reactants and the products do not change."

Then on dynamic equilibrium I got:

"In the equilibrium mixture, ammonia and hydrogen chloride molecules join together to make ammonium chloride. At the same time, ammonium chloride molecules decompose to make ammonia and hydrogen chloride molecules. The equilibrium is dynamic. At equilibrium, these two reactions happen at the same rate. This explains why the amounts of all three chemicals do not change."

So IS there a difference between equilibrium and dynamic equilibrium or are all equilibriums dynamic?

And what on earth does it mean when an equilibrium lies towards the left or right?

[SirMasterKey]

Well not too sure on your first question but the equilibrium towards left or right is due to Le Chatilers Principle which is that 'anything that is done to the orignal "reactants" or "Products" the nature of the equilibrium means that it will try to balance out what has been done. So if you increase the concentration of the reactants on the left hnad side then the concentration of the products on the right goes up as well.

It does as much as it can to get to the orignal balance again.


Might not be best explanation but I hope it helped.

[LearningMath]

Definition of chemical dynamic equilibrium: Dynamic equilibrium is reached when the rate of forward reaction is equal to the rate of backwards reaction.

The dynamic part basically means 'moving', changes are occuring but they are equal and opposite, cancelling each other out.

Say you have 50mol dm^-3 of B and 30mol dm^-3 of A. B and A are the same substance but changing phases (CO2 from gaseous to aqueous for example)

B(aq) <---> A(g)

If the concentration of B is decreased from 50mol dm^-3 to 40mol dm^-3 then Le chatliers principle telling us the equilibrium will respond to cancel this change. By grabbing 10mol dm^-3 of A and making it into B. So we now have 50 mol dm^-3 of B again but only 20mol dm^-3 of A, so we say the reaction has shifted to the left.

EDIT: This site has a really good explanation manner http://www.chemguide.co.uk/physical/...chatelier.html

[lattywatty]

Originally Posted by SirMasterKey

Well not too sure on your first question but the equilibrium towards left or right is due to Le Chatilers Principle which is that 'anything that is done to the orignal "reactants" or "Products" the nature of the equilibrium means that it will try to balance out what has been done. So if you increase the concentration of the reactants on the left hnad side then the concentration of the products on the right goes up as well.

It does as much as it can to get to the orignal balance again.


Might not be best explanation but I hope it helped.

Ok so in the example:

HN03 <--> H+ + N03-

It says the equilibrium lies towards the right. I don't get why. I get that it tries to balance out but why does it lie towards the right in this case?

[Swarley]

The only difference between the types of equilibrium is that dynamic equilibrium means that there is no change in the concentrations of the reactants. A dynamic equilibrium is a closed system so no new reactants are added and none are removed so when it reaches equilibrium all the concentrations don't change and it might appear as if the reaction has stopped but it just means that both the forward and backwards reactions are going at the same rate.

[LearningMath]

Originally Posted by lattywatty

Ok so in the example:

HN03 <--> H+ + N03-

It says the equilibrium lies towards the right. I don't get why. I get that it tries to balance out but why does it lie towards the right in this case?

What factors are effecting the reaction, such as temp, conc, pressure...?

[SirMasterKey]

Originally Posted by lattywatty

Ok so in the example:

HN03 <--> H+ + N03-

It says the equilibrium lies towards the right. I don't get why. I get that it tries to balance out but why does it lie towards the right in this case?

As poster above me said what are the conditions and what are the states? I assume the states are all aqueous die to the ions.

[lattywatty]

Originally Posted by LearningMath

Definition of chemical dynamic equilibrium: Dynamic equilibrium is reached when the rate of forward reaction is equal to the rate of backwards reaction.

The dynamic part basically means 'moving', changes are occuring but they are equal and opposite, cancelling each other out.

Say you have 50mol dm^-3 of B and 30mol dm^-3 of A. B and A are the same substance but changing phases (CO2 from gaseous to aqueous for example)

B(aq) <---> A(g)

If the concentration of B is decreased from 50mol dm^-3 to 40mol dm^-3 then Le chatliers principle telling us the equilibrium will respond to cancel this change. By grabbing 10mol dm^-3 of A and making it into B. So we now have 50 mol dm^-3 of B again but only 20mol dm^-3 of A, so we say the reaction has shifted to the left.

EDIT: This site has a really good explanation manner http://www.chemguide.co.uk/physical/...chatelier.html

I think I sort of get it. Just so you know I'm at GCSE and Le Chatlier isn't in the syllabus, but that helps explain it. Thanks very much!

So equilibrium is when the amounts of reactants and products are the same in a mixture but and do not change and dynamic is when the reaction is still happening but it is equal so cancelling each other out...

That sites pretty helpful too. Thanks

[knocker]

In the equilibrium HNO3 <==> H+ + NO3-

The equilibrium lies to the right because its a strong acid and therefore the HNO3 is more or less fully dissociated in solution. i.e. It has a very large Ka value if you want to understand it in those terms.

[shengoc]

when you mention large or small Ka value, and you can't quote a value(because you are not supposed to remember them), you need to compare it, as in it has large Ka value relative to ethanoic acid, but it has smaller Ka value when relative to sulphuric acid, for example.

[lattywatty]

Ok I've done the test and it didn't really come up. It did in a different context but I think I blagged my way through that. At least I can forget it now :P

[shengoc]

knowledge is for life - if you are going to do science in uni, it'd be terrible to remember stuff for the sake of exams and then forget about it. Imagine having to do that for the following year, it'd be nightmare....

[lattywatty]

Originally Posted by shengoc

knowledge is for life - if you are going to do science in uni, it'd be terrible to remember stuff for the sake of exams and then forget about it. Imagine having to do that for the following year, it'd be nightmare....

Nah I hate science I'm gonna be doing English and possibly History joint at uni.