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.
Tę umiejętność sprawdza 14 zadań wzorowanych na arkuszach IB z lat 2022–2026.
(c) A simple set-up was used to compare the conductivity of water samples obtained from the Salton Sea at different depths. The following data were obtained: (i) State the independent and the dependent variable in this experiment. (ii) Suggest two variables,…
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:…
Gallium forms a sulfate of formula 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…
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…
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: O2, cathode: H2 B. Anode: O2, cathode: K C. Anode:…
An aqueous solution of potassium iodide is electrolysed. Determine the product at each electrode, using section 19 of the data booklet.
What are the products of the electrolysis of dilute aqueous copper(II) sulfate, CuSO4(aq), using inert electrodes? A. hydrogen gas and oxygen gas B. copper metal and oxygen gas C. hydrogen gas and sulfur dioxide gas D. copper metal and sulfur dioxide…
(i) A dilute aqueous solution of sodium chloride is electrolysed using inert electrodes. Give the half-equation for the process at the anode and the half-equation for the process at the cathode. Use section 19 of the data booklet. (ii) Identify the product at…
A steel bolt is to be coated with a thin layer of a metal by electroplating, using an aqueous solution of a salt of the coating metal as the electrolyte. Deduce one metal that could be deposited on the bolt with high efficiency. Use section 19 of the data…
A dilute aqueous solution of potassium iodide, KI(aq), is electrolysed using inert graphite electrodes, as shown in the diagram. (i) State the direction in which the electrons move in the external circuit, and the direction in which the positive ions and the…
What are the products at the electrodes in the electrolysis of 1.0 mol dm−3 aqueous copper(II) sulfate using inert electrodes? A. H2(g) at the cathode and O2(g) at the anode B. Cu(s) at the cathode and SO2(g) at the…
A 1.0 mol dm−3 solution of magnesium chloride is electrolysed between inert electrodes. Which substance forms at the cathode? A. H2(g) B. Mg(s) C. Cl2(g) D. O2(g)
What are the products when dilute aqueous sodium sulfate is electrolysed using inert electrodes? E⊖(Na+∣Na) = −2.71 V Choose the products at the anode (positive electrode) and at the cathode (negative electrode). A. Anode:…
Predict, using the given values, the reaction that would take place at the anode and at the cathode during the electrolysis of a dilute aqueous solution of ammonium chloride using graphite electrodes.
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