Question

when concentrated sodium chloride solution, to which a
little universal indicator had been added, was electrolysed
in the laboratory in a Hofmann voltameter.

a) The universal indicator initially turns red in the region of the
anode, but as the electrolysis proceeds it loses its colour.
b) The universal indicator turns blue in the region of the cathode.

Answer 1

Answer:

Sorry, Don't Know The Answer

Explanation:

Answer 2

Answer:

a) Since acidity is a measure of the excess of hydrogen ions in solution (H+), the left behind hydrogen ions make the solution near the positive electrode acidic, which turns the indicator solution red. ... After the electrodes have been disconnected.

b)Since acidity is a measure of the excess of hydrogen ions in solution (H+), the left behind hydrogen ions make the solution near the positive electrode acidic, which turns the indicator solution red. The OH– left near the negative electrode make the solution basic, which shows up as blue with the indicator

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