How do you know what salt to use for salt bridge?

In summary, the conversation discusses the use of a salt bridge and how to determine which salt to use for it. It is mentioned that the salt bridge should not react and its function is to neutralize the solution and prevent build-up of ions. The process of selecting a salt that won't react is described as a "crap-shoot" and requires careful consideration to minimize effects. It is also noted that selecting a salt for cells with transport is more challenging.
  • #1
ppppparker
18
4

Homework Statement


its not a homework question but I didn't know where else to ask.
I want to know how we know which salt to use for salt bridge. I think I understand what we don't want the salt bridge to do --we don't want it to react, and that its function is to neutralize the solution so anions or cations don't build up and the cell stops working. So salt bridge replenishes the ions, right?
But how do we know which salt won't react? Is it a matter of comparing reduction potentials?
thanks for any help!

Homework Equations

The Attempt at a Solution

 
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  • #2
ppppparker said:
don't want it to react
... and, that said, things turn into a "crap-shoot." "Everything" reacts (or is totally inert). "Artful" selection yields "minimal" effects. Cells "with transport" are more difficult in which to accomplish this goal.
 

1. How do you determine the appropriate salt for a salt bridge?

The most important factor in determining the appropriate salt for a salt bridge is to choose a salt that is highly soluble in water. This allows for the movement of ions between the two electrodes in the salt bridge. Additionally, the salt should have a relatively low volatility and should not react with the electrodes or the electrolyte solution.

2. Can any type of salt be used as a salt bridge?

No, not all salts are suitable for use as a salt bridge. Some common salts used in salt bridges include potassium chloride, potassium nitrate, and sodium nitrate. These salts have high solubility in water and do not react with the electrodes or electrolyte solution.

3. How do you know if a salt is compatible with the electrodes in a salt bridge?

The compatibility of a salt with the electrodes can be determined by researching the chemical properties of both the salt and the electrodes. Additionally, conducting a trial run with the salt and electrodes can help determine compatibility.

4. Is there a specific concentration of salt that should be used in a salt bridge?

The concentration of salt in a salt bridge is typically around 1M. However, the exact concentration may vary depending on the specific experiment or application. It is important to consult literature or conduct experiments to determine the appropriate concentration for your specific needs.

5. Can the type of salt used in a salt bridge affect the accuracy of results?

Yes, the type of salt used in a salt bridge can have an impact on the accuracy of results. Some salts may introduce additional ions that can interfere with the desired electrochemical reaction, leading to inaccurate results. It is important to carefully consider the salt used in a salt bridge to ensure the most accurate results.

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