Electrolysis of aqueous solutions

Deduce the products of electrolysis of water and of aqueous solutions such as NaCl, CuSO4 and Na2SO4 by comparing the standard electrode potentials of the competing reactions of ions and water at each electrode, considering concentration and electrode material.

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Zadanie 35Paper 1A, maj 2026
wzorowane1 pktzamknięteśrednie (szac.)

Which products are produced at the electrodes by the electrolysis of aqueous sodium iodide? A. Product at cathode: sodium; product at anode: iodine B. Product at cathode: hydrogen; product at anode: iodine C. Product at cathode: iodine; product at anode:…

Zadanie 2bPaper 2, maj 2025, TZ2
wzorowane14 pktobliczenioweśrednie (szac.)

Gallium forms a sulfate of formula GaX2(SOX4)X3\ce{Ga2(SO4)3}. (i) Both ionic and covalent bonding are present in this compound. State which particles are held together by each type of bond. (ii) Contrast covalent and ionic bonds in terms of what happens to the valence…

Zadanie 39Paper 1A, maj 2025, TZ2
wzorowane1 pktzamknięteśrednie (szac.)

What are the products of the electrolysis of concentrated aqueous sodium chloride using inert electrodes? In each option the product at the anode is given first and the product at the cathode second. A. chlorine gas, hydrogen gas B. chlorine gas, sodium metal…

Zadanie 37Paper 1A, listopad 2025, TZ3
wzorowane1 pktzamknięteśrednie (szac.)

A concentrated aqueous solution of potassium bromide is electrolysed between inert electrodes. Which products are mainly formed at the anode and at the cathode? A. Anode: OX2\ce{O2}, cathode: HX2\ce{H2} B. Anode: OX2\ce{O2}, cathode: K\ce{K} C. Anode:…

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