The diagram below shows the extraction of sodium metal using the Downs cell. Study it and answer the questions that follow:

      

The diagram below shows the extraction of sodium metal using the Downs cell. Study it and answer the questions that follow:
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(i) Explain why in this process the sodium chloride is mixed with calcium chloride.
(ii) Why is the anode made of graphite and not steel?
(iii) State the properties of sodium metal that makes it possible for it to be collected as shown in the diagram.
iv) What is the function of the steel guaze cylinder?
v)Why is the anode made of graphite in this case instead of steel which is a better conductor of electricity?
vi)Give reasons why large quantities of electricity is required for this process


  

Answers


John
(i) It is mixed to lower the melting point of sodium chloride to 600o C hence reducing the cost of producing Sodium

(ii) Steel would react with chlorine while graphite will not.

(iii) - melting point of sodium is lower than that of the electrolyte.

- Sodium is less dense than the electrolyte.

iv) It prevents the chlorine and sodium from mixing

v) Chlorine gas would react with steel anode

vi) Melt the ore, rock salt
- For electrolysis of the molten ore
johnmulu answered the question on May 16, 2017 at 12:40


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