Electrochemistry, emf vs HCL concentration

In summary, the conversation discusses a pchem lab where electric potential measurements were taken with different concentrations of HCl. The expected result was for the electric potential to increase as the HCl concentration increased, but the actual results showed the opposite. The conversation also mentions the Nernst equation and the relationship between HCl and Ag+ concentrations.
  • #1
Puchinita5
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Homework Statement



I just conducted a lab for pchem where we took electric potential measurements with a volt meter in a solution for the reaction

AgCl(s) +1/2 H2 (g) <--> HCl(aq) + Ag(s)

We took the measurements using different concentrations of HCl.

We were told that the electric potential emf measurements should go up as the concentration of HCl went up. However, our results did the exact opposite.


I am wondering if anyone has an idea of what we could have gone wrong?


Homework Equations





The Attempt at a Solution

 
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  • #2
Puchinita5 said:
We were told that the electric potential emf measurements should go up as the concentration of HCl went up. However, our results did the exact opposite.

You better believe your experimental results, not what you were told.

Can you write Nernst equation for the silver reduction half cell?

What happens to the concentration of Ag+ as the concentration of HCl goes up?
 

1. What is electrochemistry?

Electrochemistry is a branch of chemistry that deals with the study of the relationship between electricity and chemical reactions. It involves the conversion of chemical energy into electrical energy and vice versa.

2. What is emf?

Emf stands for electromotive force, which is the potential difference between two electrodes in an electrochemical cell. It is a measure of the cell's ability to convert chemical energy into electrical energy.

3. How does emf vary with HCl concentration?

The emf of an electrochemical cell is directly proportional to the concentration of HCl. This means that as the concentration of HCl increases, the emf also increases. This relationship is known as the Nernst equation.

4. What factors can affect the emf of an electrochemical cell?

The emf of an electrochemical cell can be affected by factors such as temperature, concentration of reactants, and surface area of the electrodes. Changes in these factors can alter the rate of the chemical reactions taking place in the cell, thereby affecting the emf.

5. What is the significance of studying emf vs HCl concentration?

Studying the relationship between emf and HCl concentration is important in understanding the behavior of electrochemical cells and predicting their performance in various conditions. This knowledge is crucial in the development of new technologies such as batteries and fuel cells.

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