# Equilibrium question help

Watch
Announcements
#1
The student adds an excess of aqueous silver nitrate, AgNO3(aq), to the equilibrium mixture.
Predict what would be observed. Explain the observations in terms of both equilibrium 1 and equilibrium 2 and any species formed.

Hi, I know that when silver nitrate is added to 2, a yellow ppt forms (AgI) as the silver ions react with the I- ions. But I don't understand why there will be any reaction in 1. There is no I- ions in 1 but apparently the postion of equilibrium will shift to the left and soild I2 forms. Why??

Thanks
0
3 years ago
#2
(Original post by coconut64)
The student adds an excess of aqueous silver nitrate, AgNO3(aq), to the equilibrium mixture.
Predict what would be observed. Explain the observations in terms of both equilibrium 1 and equilibrium 2 and any species formed.

Hi, I know that when silver nitrate is added to 2, a yellow ppt forms (AgI) as the silver ions react with the I- ions. But I don't understand why there will be any reaction in 1. There is no I- ions in 1 but apparently the postion of equilibrium will shift to the left and soild I2 forms. Why??

Thanks
Read the question. You must explain the observation in terms of both equilibrium 1 and equilibrium 2.

OK, forget equilibrium 1 for a moment.

Addition of silver ions to equilibrium 2 removes iodide ions and pulls the equilibrim to the LHS. This also makes more iodine in solution.

Now refer to equilibrium 1 and you will see the effect of increasing the amount of iodine drives this equilibrium to the LHS making more solid iodine.
0
#3
(Original post by charco)
Read the question. You must explain the observation in terms of both equilibrium 1 and equilibrium 2.

OK, forget equilibrium 1 for a moment.

Addition of silver ions to equilibrium 2 removes iodide ions and pulls the equilibrim to the LHS. This also makes more iodine in solution.

Now refer to equilibrium 1 and you will see the effect of increasing the amount of iodine drives this equilibrium to the LHS making more solid iodine.
That makes sense thank you. However I wouldn't have thought of that, how do you know that the two equilibriums link to the same experiment? How do you know I2 (aq) from experiment 2 is I2(aq) in equilibrium 1? Is this question saying that you have two different reactions going on at the same time, thus 2 equilibriums?

Thanks
1
#4
??
0
X

new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

#### Have you experienced financial difficulties as a student due to Covid-19?

Yes, I have really struggled financially (53)
17.21%
I have experienced some financial difficulties (88)
28.57%
I haven't experienced any financial difficulties and things have stayed the same (117)
37.99%
I have had better financial opportunities as a result of the pandemic (40)
12.99%
3.25%