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Electrolysis of concentrated sodium chloride using graphite electrodes. Will the...

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yousawinner | Student, Undergraduate | (Level 1) Salutatorian

Posted October 16, 2012 at 6:50 PM via web

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Electrolysis of concentrated sodium chloride using graphite electrodes. Will the solution be acidic,neutral or alkaline when the experiment is completed?

Please explain your answer.

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jerichorayel | College Teacher | (Level 1) Senior Educator

Posted October 17, 2012 at 8:03 AM (Answer #1)

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Hello!

It is alkaline.

The alkalinity of the solution is due to the capacity of the solution to neutralize acid. This happens when hydroxide content will increase. Apparently in this process we will try to look if any hydroxide will form in the electrolysis of concentrated NaCl solution.

During the electrolysis of NaCl solution, the following phenomena happens:

Chlorine gas forms at the anode

Hydrogen gas forms at the cathode

a solution of sodium hydroxide is forms

amount of sodium Chloride decreases

The formation of Sodium Hydroxide will make the solution alkaline.

Hope this helps :)

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yousawinner | Student, Undergraduate | (Level 1) Salutatorian

Posted October 17, 2012 at 7:55 AM (Answer #2)

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My answer is that the solution will be alkaline (NaOH will be formed) because the chlorine will be given off at the anode and hydrogen at the cathode.. 

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