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A glass electrode reading 0.177 V above its value in a pH 7 buffer indicates a pH of about

  • A.10
  • B.3
  • C.7
  • D.4

Answer: D

Dividing 0.177 by 0.0591 gives three pH units, and a more positive potential means a higher hydrogen ion activity, so the pH is three units below seven. A reading below the buffer value would indicate an alkaline solution.

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