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A pH electrode is attached to a sensitive voltmeter which reads 0.652V when the electrode is...

  1. A pH electrode is attached to a sensitive voltmeter which reads 0.652V when the electrode is immersed in a buffer solution with a pH of 6.7. After the pH electrode is moved to an unknown buffer solution, the reading of the voltmeter is decreased by 20%. Calculate the pH of the unknown buffer solution. Assume the temperature is 25 oC.
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