(c) What is , the electromotive efficiency to three significant figures?? Open t

Question

(c) What is , the electromotive efficiency to three significant figures?? Open the hint panel below for the definition of electromotive efficiency.

The other parts I got correct, but I couldn't get c) correct.

Please solve part c) and show working.

Question 8 of 12 I Incorrect Map a Sapling Learning Calibration of a glass electrode gave a reading of 142.5 mV with 0.05 m potassium hydrogen phthalate buffer standard (pH 4.015) and a reading of -59.4 mV with 0.08 m HEPES, 0.08 m NaHÉPES, 0.08 m NaCl buffer standard (pH-7.454), both measured at 30°C (a) What is the observed slope (mV/pH unit) of the calibration curve? Number Sloprved 58.71mV/ pH (b) What is the theoretical slope at 30°C? Number Slope theoretical = 1-60.231 | mn V / pH (c) What is , the electromotive efficiency to three significant figures?? Open the hint panel below for the definition of electromotive efficiency Number = 1.38 (d) What is the pH of an unknown that gives a reading of 49.5 mV with this electrode at 30°C? Number pH =115.599086 Incorrect

Explanation / Answer

c)

beta = observed / theoretical

        = - 58.71 / - 60.231

beta = 0.975

d)

- 58.71 = 142.5 - 49.5 / 4.015 - pHunknown

pH = 5.599

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