Lawrie Ryan and Roger Norris Solutions for Chapter: Electrochemistry, Exercise 25: EXAM-STYLE QUESTIONS

Concentrated aqueous sodium chloride can be electrolysed in the laboratory using graphite electrodes. Write the formulae for all the ions present in an aqueous solution of sodium chloride.

Concentrated aqueous sodium chloride can be electrolysed in the laboratory using graphite electrodes. Write half-equations to show the reaction at the anode.

Concentrated aqueous sodium chloride can be electrolysed in the laboratory using graphite electrodes. Write half-equations to show the reaction at the cathode.

Concentrated aqueous sodium chloride can be electrolysed in the laboratory using graphite electrodes. Explain why the reaction at the anode is classed as oxidation.

Concentrated aqueous sodium chloride can be electrolysed in the laboratory using graphite electrodes. After a while, the solution near the cathode becomes very alkaline. Explain why?

Concentrated aqueous sodium chloride can be electrolysed in the laboratory using graphite electrodes. The chlorine produced at the anode can react with warm concentrated sodium hydroxide:

${\mathrm{Cl}}_2+6\mathrm{NaOH}\stackrel{ }{\to }5\mathrm{NaCl}+{\mathrm{NaClO}}_3+3{\mathrm{H}}_2\mathrm{O}$

Deduce the oxidation number changes per atom of chlorine when ${\mathrm{Cl}}_2$ is converted to $\mathrm{NaCl}$.

Concentrated aqueous sodium chloride can be electrolysed in the laboratory using graphite electrodes. The chlorine produced at the anode can react with warm concentrated sodium hydroxide:

${\mathrm{Cl}}_2+6\mathrm{NaOH}\stackrel{ }{\to }5\mathrm{NaCl}+{\mathrm{NaClO}}_3+3{\mathrm{H}}_2\mathrm{O}$

Deduce the oxidation number changes per atom of chlorine when ${\mathrm{Cl}}_2$ is converted to ${\mathrm{NaClO}}_3$.

Give the systematic name for the compound ${\mathrm{NaClO}}_3$.