Chem II Lab 20: Faradays Constant an Avagadros #
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13 Terms
What is the primary objective of Lab 20?
To determine the values of Faraday’s Constant (F) and Avogadro’s Number (NA) by performing the electrolysis of acidified water.
reduction half run for electrolysis of water
2H+(aq)+2e—>H2(g)
oxidation half run for electrolysis of water
2H2O(l)→O2(g)+4H+(aq)+4e-
net equation of electrolysis of water
2H2O(l)→2H2(g)+O2(g)
how did we find the Pwater column
height of water column from liquid/ 13.6mmHg)
How did we find PH2
subtract Pbarometer - Pwater vapor - Pwater column
how did we get the barometric pressure
it was given in inchesHg and we converted it to mm
how do we find moles of H2 gas released ?
PV=nRT, n= PV/RT
P in PV=nRT
partial pressure in atmhow
how to determine charge passed thru cell during experiment?
multiply I (current) x t (seconds)
how did we find the moles of electrons
for every mole of H2, 2 electrons were needed so nelectrons= nH2 × 2
how did we calculate Faradays constant ?
divide Q (total columbs) by electrons
how did we calculate avagadros # ?
divide our experimental faraday constant by the charge of a single electron