Print Calculator Periodic Table Question 10 of 11 Map Sapling Learning Calibrati

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Print Calculator Periodic Table Question 10 of 11 Map Sapling Learning Calibration of a electrode a of 132.9 mv with 0.05 m hydrogen phthalate standard (pH and a reading of -63.6 with 0.008695 potassium dihydrogen phosphate, 0.0343 m disodium hydrogen phosphate buffer standard (pH 7.400), both measured at 30 (a) What is the observed slope (mVIpH unit) of the calibration curve? Number mV/ pH Slopee bserved (b) What is the theoretical slope at 30°C? Number mV/ pH Slope theoretical (c) What is B, the electromotive efficiency to three significant figures?? open the hint panel below for the definition of electromotive efficiency. Number (d) What is the ph of an unknown that gives a reading of 25.5 mV with this electrode at 30 C? Number pH Previous Q Give Up & View solution Check Answer Next Exit

Explanation / Answer

a)

Observed slope = E1 - E2 / pHbuffer1 - pHbuffer2

                                   = 132.9 - (-63.6) / 4.015 - 7.400

Observed slope = - 58.05 mV / pH

b)

theoretical slope E = Eo - 0.1984 T

                              = 0 - (0.1984 x 303)

theoretical slope E = - 60.11 mV/pH

c)

beta = observed / theoretical = - 58.05 / 60.11

beta = 0.966

d)

- 58.05 = 132.9 - 25.5 / 4.015 - pHunknown

pH = 4.56

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