Question

Account for the following observations which were made 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 colors.

B) The universal indicator turns blue in the region of the cathode.

Answer 1

Answer:

In this experiment, students observe what happens during the electrolysis of brine (sodium chloride solution), using universal indicator to help them follow the reaction that takes place.

The experiment works well if students are directed to make detailed observations and then attempt to explain for themselves what they think is happening.

The main issue is likely to be the availability of sufficient U-shaped test tubes.

Explanation:

your answer