# Equiliberium and Concentration question (1 Viewer)

#### carlytse621

##### Member
i put:

1st change = temp increase
2nd change = CO concentration decreased manually.
3rd change = pressure reduced
I put the same thing
but the last one i put total pressure is decreased so all concentration drop dramatically
same thing anyway....xD

Last edited:

#### NoName91

##### Member
I put the same thing
but the last one i put total pressure is decreased so all concentration drop dramatically
same thing anyway....xD
Pressure can't change the total concntration... but it can shift it

#### carlytse621

##### Member
Pressure can't change the total concntration... but it can shift it
hmmmm.....
i said Pressure is proportional to the inverse of volume
and since concentration is proportional to the inverse of volume as well
therefore Pressure is portional to concentration.... : S
maths trick~

#### Gibbatron

##### Member
Pressure can't change the total concntration... but it can shift it
Pressure wont change the total amount of each substance present but it will change how much of each substance is present per unit volume, or concentration for short.

#### David.Lai

##### New Member
hmmmm.....
i said Pressure is proportional to the inverse of volume
and since concentration is proportional to the inverse of volume as well
therefore Pressure is portional to concentration.... : S
maths trick~
you are correct, that is what i put. The mathematical expression is actually described as Boyle's Law. In this question also, Le Chatliers principle must be stated and emphasised, as it is the cause of each effect. If the principle were to be false, these changes would not have occured, thus Le Chatliers principle is critical within each change.

#### walk

##### Midgely
Cl2 went from 0.12 to 0.08 = drop of one third
CO went from .06 to .04 = a drop of one third
COCl2 went from .03 to .02 = a drop of one third

This is because the volume of the container was reduced by one third

#### Aerath

##### Retired
Ohhh, shit. Did we have to say anything about volume beingreduced by a third? Lame.

#### Gibbatron

##### Member
Ohhh, shit. Did we have to say anything about volume beingreduced by a third? Lame.
I hope not. I just said pressure on total system was reduced, shifting equilibrium to the right.

#### Aerath

##### Retired
I hope not. I just said pressure on total system was reduced, shifting equilibrium to the right.
Yeah, that's what I said. Didn't pay that much attention to how much it dropped.

#### chuboy

##### Member
Cl2 went from 0.12 to 0.08 = drop of one third
CO went from .06 to .04 = a drop of one third
COCl2 went from .03 to .02 = a drop of one third

This is because the volume of the container was reduced by one third
Actually, the volume increased, thats why the concentration went down.

Although I just said they scooped 1/3 of the gases out (since they would have been evenly mixed) since I didn't think it was possible to change the shape of a container in such a way, and because there was less gas, the concentration decreased and the pressure decreased, pushing the equilibrium to the right.

#### walk

##### Midgely
Yes....should have written that the volume increased by a third to make the concentrations drop like this ...thankx

#### Shoom

##### Member
ok stupid me wrote this

first 4 minutes or wateva the systems at equilibrium, then theres a change, I said the temp is increased favouring the forward reaction, because its endothermic and I also said pressure was decreased, so to counteract the change the side with more moles of gas is favoured.

THEN STUPID ME, when they all dropped in the straight line I said the system was trying to restablish equilibrium, then it changed again and I once again said increase in temp and decrease in pressure, but not as much as before shown by the less steep curve of the graph.

1/6 fuck.

#### matt527

##### New Member
you are correct, that is what i put. The mathematical expression is actually described as Boyle's Law. In this question also, Le Chatliers principle must be stated and emphasised, as it is the cause of each effect. If the principle were to be false, these changes would not have occured, thus Le Chatliers principle is critical within each change.
i think the 3rd one may be debatable for now ..

however ... i agreed with this guy...
Le'Chataliers principle most probably had to have been stated and refered to when describing each change if u wanted full marks