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I believe nitrate is a spectator ion in this case. In other words, AgNO3 was dissolved to achieve Ag+ ions in solution but the NO3- is not involved in the actual reaction.
Skyllar Kuppinger 1F wrote:What is the point of the nitrate in this concentration cell?? (Image attached)What does it do? Does it keep the solution neutral? If so how?
I believe that the nitrate keeps the solution neutral though balancing out the Ag+ ions. That is why there is a porous disk, think of it as a form of salt bridge, in that it allows for ions to move to balance charge. I hope this helps!
While the nitrate is not necessarily involved in the reaction itself, its purpose, like the salt bridge, is to allow ions to flow so that the charge can balance.
Like everyone is saying, nitrate diffuses through the porous disk to balance the charges on both sides. The actual reaction that is occurring is for Ag+(aq) and Ag(s), but NO3- is important for the concentration cell as well.
You can't just put gold ions in solution, you need it to be dissolved from another compound.
In order to balance the charges nitrate flows through the porous disk.
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