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If the concentration of reactants in a redox reaction is doubled, how does it af

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Question: If the concentration of reactants in a redox reaction is doubled, how does it affect the cell potential according to the Nernst equation?

Options:

  1. Increases
  2. Decreases
  3. Remains the same
  4. Depends on temperature

Correct Answer: Decreases

Solution: 

Doubling the concentration of reactants increases Q, which decreases E according to the Nernst equation.

If the concentration of reactants in a redox reaction is doubled, how does it af

Practice Questions

Q1
If the concentration of reactants in a redox reaction is doubled, how does it affect the cell potential according to the Nernst equation?
  1. Increases
  2. Decreases
  3. Remains the same
  4. Depends on temperature

Questions & Step-by-Step Solutions

If the concentration of reactants in a redox reaction is doubled, how does it affect the cell potential according to the Nernst equation?
  • Step 1: Understand that a redox reaction involves reactants and products, and their concentrations can affect the reaction's behavior.
  • Step 2: Familiarize yourself with the Nernst equation, which relates the cell potential (E) to the concentrations of reactants and products.
  • Step 3: Recognize that in the Nernst equation, Q represents the reaction quotient, which is calculated using the concentrations of the products and reactants.
  • Step 4: When the concentration of reactants is doubled, the value of Q increases because the reactants are in the denominator of the equation for Q.
  • Step 5: According to the Nernst equation, if Q increases, the cell potential (E) decreases.
  • Step 6: Conclude that doubling the concentration of reactants leads to a decrease in cell potential.
  • Nernst Equation – The Nernst equation relates the cell potential (E) to the concentrations of reactants and products in a redox reaction, showing how changes in concentration affect the potential.
  • Reaction Quotient (Q) – Q is the ratio of the concentrations of products to reactants at any point in time, and it is used in the Nernst equation to determine the effect of concentration changes on cell potential.
  • Cell Potential (E) – Cell potential is the measure of the driving force behind a redox reaction, which can be influenced by the concentrations of the reactants and products.
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