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What are the typical oxidation states of the following
Elements
Monoatomic ions
Hydrogen
Oxygen
0
Usually the charge
+1, unless metal hydrides -1
-2, unless peroxides -1
What is the purpose of a salt bridge in electrolysis?
Maintains electrical neutrality
Describe the electrolysis of aqueous solution of salts (NaCl eg)
The electrodes are immersed in the aqueous solution of sodium chloride
At the cathode, water is reduced to hydrogen gas and hydroxide ions, and Na+ gains an e-
At the anode, water is oxidised to oxygen gas and hydrogen ions, and CL- loses an e-
.