coconut64
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Name:  sw.png
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Size:  30.2 KBThe 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??

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charco
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(Original post by coconut64)
Name:  sw.png
Views: 698
Size:  30.2 KBThe 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.
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coconut64
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(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?

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coconut64
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