The Chemistry of Sodium Chloride. L.O. I know the products of electrolysing molten sodium chloride and sodium chloride solution. I know what these products are used to make. Recapping Alcohols – backs of books. Name these alcohols:- 1. C 2 H 5 OH 2. C 5 H 11 OH
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I know the products of electrolysing molten sodium chloride and sodium chloride solution.
I know what these products are used to make.
Name these alcohols:-
Write the molecular formula of these
Name the two ways of producing ethanol
In the electrolysis of molten NaCl, the negative chloride ions
(Cl-) are attracted to the
Here, the Cl- ionslose
electrons to make
chlorine atoms, which then
form chlorine molecules (Cl2).
2Cl- Cl2 + 2e-(oxidation)
In the electrolysis of molten NaCl, the positive sodium ions
(Na+) are attracted to the
Here, the Na+ ions
gain electrons to make
Na+ + e- Na(reduction)
In the electrolysis of sodium chloride solution, the Na+ions might be expected
to form sodium at the negative electrode.
Instead, hydrogen gas is produced here.
This is because sodium chloride solution also contains H+ ions from some of the water: H2O (l) H+ (aq) + OH- (aq).
At the negative electrode, the H+ ions compete with the Na+ions. The H+ ions gain electrons; the Na+ ions stay in solution.
In the electrolysis of NaCl solution, the positive hydrogen ions
(H+) are attracted to the
Here, the H+ ions
gain electrons to make
hydrogen atoms, which then
form hydrogen molecules (H2).
2H+ + 2e- H2(reduction)
Sodium chloride solution has four types of ions:
The Cl- ions form chlorineat the positive electrode and the H+ ions form hydrogenat the negative electrode. So, what’s left?
Na+ and OH- ions are left behind and so a solution of sodium hydroxide (NaOH)is formed.
What is the overall equation for the electrolysis of a sodium chloride solution?
Product at the negative electrode
platinumHydrogen or metal?
If an ionic compound containsa metal
that is more reactive than hydrogen, electrolysis of a solution of the compound will produce hydrogen, not the metal.
Complete the table for these compounds.
The electrolysis of sodium chloride solution produces three very useful products:
Chlorine is expected as a product of this process but hydrogen and sodium hydroxide are surprising products.
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