Chemistry
Acidulated water is electrolysed using platinum electrodes. Answer the following questions:
(a) Why is dilute sulphuric acid added to water?
(b) Write the reaction taking place at the cathode.
(c) What is the observation at the anode?
Electrolysis
12 Likes
Answer
(a) Water in pure state consists almost entirely of molecules. It is a polar covalent compound and can form ions when traces of dilute sulphuric acid is added.
(b) 4H+ + 4e- ⟶ 4H
2H + 2H ⟶ 2H2
(c) At the anode (positive electrode) hydroxide ions are preferentially discharged, producing oxygen gas:
4OH- - 4e- ⟶ 4OH
4OH ⟶ 2H2O + O2
Answered By
8 Likes
Related Questions
Answer the following questions with reference to the concentration of bauxite ore.
(a) Name the process used to concentrate the ore.
(b) Give a balanced chemical equation for the conversion of aluminium hydroxide to pure alumina.
Draw the dot and cross structure of the following:
(a) An ionic compound formed when Mg reacts with the dilute HCl.
(b) A covalent compound formed when H2 reacts with Cl2.
(c) The positive ion produced when ammonia gas is dissolved in water.
[Atomic number: Mg = 12, Cl = 17, H = 1, N = 7](a) State Avogadro’s Law.
(b) Define Co-ordinate bond.
Differentiate between the following pairs of compounds using the reagent given in the bracket:
(a) Ammonium chloride and Sodium chloride (using an alkali)
(b) Zinc Nitrate solution and Calcium Nitrate solution (using excess sodium hydroxide solution)