# buffer solution question A2

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#1
for the 2 question in equlibrim, if we had OH- ions eg OH- reacts with H+ and make H20 but this H+ IS being used up so the equilbirum shifts to the right why though? if H+ is being used up the EQ should move to the left where CH3COOH is being broken down to make H+ not to the right where H+ is reacting with CH3COO- to make CH3COOH
Last edited by interlanken-fall; 1 month ago
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1 month ago
#2
I can’t see the question but shifting to the right means more product made I think you’ve got shifting to the right hand side and left hand side confused
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#3
(Original post by Hellllpppp)
I can’t see the question but shifting to the right means more product made I think you’ve got shifting to the right hand side and left hand side confused
let me get a screenshot and explain my question
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#4
(Original post by interlanken-fall)
let me get a screenshot and explain my question
here so if we add OH- it reacts with NH4+ and forms NH3 AND H20, so the equilibrium shifts to the left, I understand this as we get more h20 and nh3 it goes to the left which is the reaction where it is broken down creating more NH4+ and OH-.

if we add H+ it reacts with the OH-, however it says the eqilbirum moves to the right to replace the OH- but why though? shouldn't it move to the left as the left is where NH3 and H20 react to form more OH- and NH4+ ions? so why does it move to the right then left
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1 month ago
#5
(Original post by interlanken-fall)
if we add H+ it reacts with the OH-, however it says the eqilbirum moves to the right to replace the OH- but why though? shouldn't it move to the left as the left is where NH3 and H20 react to form more OH- and NH4+ ions? so why does it move to the right then left
Moving to the right means NH3 and H20 react to form more OH- and NH4+ ions

When you say shift to right/left it means produce more of whatever is on the side your shifting towards.
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#6
(Original post by Hellllpppp)
Moving to the right means NH3 and H20 react to form more OH- and NH4+ ions

When you say shift to right/left it means produce more of whatever is on the side your shifting towards.
I have another question in the screenshot there's a high conc of NH3 as it dissociates weakly, why does it say equilibrium lies way over to the left? should it be on the right as the conc of nh4 and oh are low?
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1 month ago
#7
(Original post by interlanken-fall)
I have another question in the screenshot there's a high conc of NH3 as it dissociates weakly, why does it say equilibrium lies way over to the left? should it be on the right as the conc of nh4 and oh are low?
If it lies on the left that means there’s more of what’s on the left just like if you shift to the left you produce more of what’s on the left.
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#8
(Original post by Hellllpppp)
If it lies on the left that means there’s more of what’s on the left just like if you shift to the left you produce more of what’s on the left.
shouldnt it lie to the right so it can make the conc of nh4 and oh higher? so it can be equal to nh3?
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1 month ago
#9
(Original post by interlanken-fall)
shouldnt it lie to the right so it can make the conc of nh4 and oh higher? so it can be equal to nh3?
When the position of equilibrium shifts you do it to oppose a change rather than make each side equal.

“Lie” isn’t talking about shifting the position of equilibrium (le chatliers principal), when at equilibrium the concentration of nh4+ and oh- are just low as the ammonia is a weak base as the lone pair of electrons isnt very available for protonation. This means the Kc value is small.
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#10
(Original post by Hellllpppp)
When the position of equilibrium shifts you do it to oppose a change rather than make each side equal.

“Lie” isn’t talking about shifting the position of equilibrium (le chatliers principal), when at equilibrium the concentration of nh4+ and oh- are just low as the ammonia is a weak base as the lone pair of electrons isnt very available for protonation. This means the Kc value is small.
so due to the fact that nh3 has a higher conc initially the equilibrium will be on the left with it
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1 month ago
#11
(Original post by interlanken-fall)
so due to the fact that nh3 has a higher conc initially the equilibrium will be on the left with it
Yep
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