ELECTRON TRANSFER IN CHEMICAL REACTIONS CHM 152 LAB CALIBRATION OF GAS BURET Ini

Question

ELECTRON TRANSFER IN CHEMICAL REACTIONS CHM 152 LAB CALIBRATION OF GAS BURET Initial mass beaker + water (g) Final mass beaker+ water (g) Mass water added to buret (g) Room temperature (C) Density of water from Handbook (g/ml) Volume of water added to buret (ml) COULOMBS TRANSFERRE Time of reaction (sec) Initial current (amp) Final current (amp) 52, 46 18,33 4.33 arc 0.99. 1.334 m 0.18 LOL 0 0.89 Average current (amp) 55 1. 8 Coulombs transferred (q=it) MOLES OF HYDROGEN GAS Liquid level in buret (ml) 50.00 - liquid level in buret (ml) Volume of uncalibrated space in buret (ml) Volume of hydrogen (ml) Volume of hydrogen (L) 8.3 8.3 1.374 S.543 0 03 55

Explanation / Answer

63.546 gm of Cu = 1 mole

0.175 gm of Cu = 2.7*10-3 mole. As 2 mole of H2 is evolved so per electron mole of Cu = 1.37*10-3 .

So the final equation is , Cu = Cu2+ + 2e

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