Why do double displacement reaction occur?

Click For Summary

Discussion Overview

The discussion revolves around the reasons for double displacement reactions, particularly focusing on the ion exchange between compounds and the stability of the resulting products. Participants explore the underlying principles of ionic reactions, using the example of the reaction between silver nitrate and sodium chloride.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the necessity of double displacement reactions, asking what benefits arise from ion exchange when compounds are already in a stable bonded state.
  • Another participant argues that just because compounds are stable does not mean they cannot bond better, suggesting that the reaction leads to a more stable configuration.
  • There is a correction regarding the initial example, with a participant stating that the net ionic reaction should be considered to understand what is happening during the reaction.
  • Participants discuss the dissociation of AgNO3 and NaCl into ions in aqueous solution and the formation of AgCl as a precipitate, questioning the stability of the products compared to the reactants.
  • One participant emphasizes that the interaction of ions in solution can lead to the formation of insoluble products, which is a key factor in double displacement reactions.

Areas of Agreement / Disagreement

Participants express differing views on the reasons for double displacement reactions, with no consensus reached on the necessity or benefits of such reactions. The discussion remains unresolved regarding the underlying principles and stability of the products formed.

Contextual Notes

There are limitations in the discussion regarding the assumptions made about stability and bonding, as well as the need for clarity on the differences between various ionic reactions.

Quotes
Messages
29
Reaction score
1
What's the reason for which double displacement reaction occur? Why there is a need for ion exchange between two compounds? They are already in a bonded state, a stabilised one. So what benefit would a double displacement reaction give?
The ionic reaction
AgNO3 +NaCl - - - - > AgCl(ppt) + NaNO3

(I think that due the reason that Eored for Ag is more than for Na the reaction must have occurred. But still it doesn't seem satisfying... Please explain. Thanks in advance.)
 
Chemistry news on Phys.org
Quotes said:
They are already in a bonded state, a stabilised one.

Doesn't mean they can't bond better, getting more stabilized.

But your example is trivially wrong - it is not AgNO3 that reacts with NaCl. Write the net ionic reaction and you will see what is really happening.
 
Borek said:
Doesn't mean they can't bond better, getting more stabilized.

But your example is trivially wrong - it is not AgNO3 that reacts with NaCl. Write the net ionic reaction and you will see what is really happening.
AgNO3 and NaCl dissociates into ions in aqueous solution and forms the products mentioned above which are more stable than the reacting compounds. Is this correct?
 
Quotes said:
AgNO3 and NaCl dissociates into ions in aqueous solution and forms the products mentioned above which are more stable than the reacting compounds. Is this correct?

It doesn't say anything about why - and how the situation described differs from - say - the mixture of NaCl and KNO3.
 
NaCl and AgNO3 are both ionic compounds capable of dissociation in water. So when aqueous solutions of both of these compounds are mixed you will have one contain of water which has Na+, Ag+, Cl-, and NO3- ions dissolved in it.

But wait, nothing is stopping these ions from interacting and colliding with one another in the aqueous environment. AgCl is not able to dissolve in water though, so when Ag+ and Cl- find each other, they stay that way as AgCl and crash out (precipitate).

The same dissociation happens when any two soluble ionic compounds are mixed. The difference is, do they for something that is insoluble in the environment they are in or not?
 

Similar threads

  • · Replies 4 ·
Replies
4
Views
6K
  • · Replies 9 ·
Replies
9
Views
3K
Replies
5
Views
3K
  • · Replies 2 ·
Replies
2
Views
3K
Replies
3
Views
5K
Replies
7
Views
3K
  • · Replies 1 ·
Replies
1
Views
5K
Replies
13
Views
3K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 9 ·
Replies
9
Views
6K