CAIE IGCSE Chemistry 4.1.11 Construct Ionic Half Equations for Questions

Write balanced ionic half-equations for oxidation and reduction during electrolysis.

Exam points

write cathode reduction half-equations
write anode oxidation half-equations
balance atoms and charge in ionic half-equations
select half-equations for aqueous and molten electrolysis
relate half-equations to electrode products
distinguish copper, hydrogen, oxygen and halogen half-equations

[Maximum number: 2]

This question is about the elements sodium and fluorine and the compound sodium fluoride.

Dilute aqueous sodium fluoride undergoes electrolysis.

Hydrogen is produced at the cathode.

Write an ionic half-equation for the production of hydrogen at the cathode.

$2 \mathrm{H}^{+}+2 \mathrm{e}\left(^{-}\right) \rightarrow \mathrm{H}_{2}$

M1 $\mathrm{H}^{+}+\mathrm{e}(-)$ on left hand side(1)

M2 equation fully correct(1)

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CAIE IGCSE Chemistry 4.1.11 Construct Ionic Half Equations for Questions question 1