QUANTITATIVE ELECTROLYSIS (Unit 3 PPA 2)

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QUANTITATIVE ELECTROLYSIS (Unit 3 PPA 2)
The aim of this experiment is to determine the
quantity of electricity (in coulombs) required to
produce one mole of hydrogen by electrolysis of
dilute sulphuric acid
(1) What measurements would be taken in this
experiment?
(1) The current in amps. The time, in
seconds, that the current flows for . The
volume of hydrogen gas collected (in cm3).
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(2) In an experiment it was found that a current
of 0.4 amps flowing for 200 seconds
produced 9.9 cm3 of hydrogen gas. Given that
the molar volume of a gas under the experimental
conditions is 23.8 litres, calculate the
number of coulombs needed to produce 1 mole
of hydrogen.
(2) Q I x t 0.4 x 200
80 C 9.9 cm3 of hydrogen was produced
by 80 Coulombs So 1 mole, 23800 cm3, of hydrogen
is produced by 80 x 23800/9.9 192 323 C