Below is a simplified diagram of a Down’s cell used for the manufacture of Sodium metal. Study it and answer the questions that follow.
a) Name the substance the anode is made of (1mk)
b) Explain your answer in (a) above (1mk)
Graphite does not react with chlorine liberated at the anode
c) What is the role of the diaphragm in Down’s cell (1mk)
To prevent metal and chlorine gas from recombining
d) In Down’s cell for the manufacture of Sodium metal, Calcium chloride salt is added to lower the melting point from 8000C to 6000C. Explain why it is necessary to lower the melting point (1mk)
To reduce the cost of energy used to melt the sodium metal
e) Calculate the mass of sodium metal produced if a current of 50 amperes is passed through the molten Sodium chloride for two (2) hours (Na = 23, F = 96500C) (2mks)
f) Below is a list of potential differences obtained when metal P, Q, R, S and T are used in the following electrochemical cell
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