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Na2SO4 or K2SO4 1. You may want to experiment by adding a drop of pH indicator...

Na2SO4 or K2SO4

1. You may want to experiment by adding a drop of pH indicator (BTB) to a drop of dilute mineral acid and then add another drop to a drop of dilute strong base (NaOH) to verify your possible answers to this question. What is indicated by the color changes of bromothymol blue in the solution surrounding the electrodes?

2. How can the changes in BTB color be helpful in identifying the products formed at the electrodes and help identify the species being reduced and oxidized?

3. A. Write the equation for the redox reaction taking place at the cathode:

B. Write the equation for the redox reaction taking place at the anode:

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