Electrolysis of Aqueous solutions

Question 1

what is different about electrolysis os aqueous solutions?

Answer 1

1) In aqueous solutions, as well as the ions from the ionic compound, there will be
hydrogen ions (H+) and hydroxide ions (0H-) from the water
2) At the cathode, if H+ ions and metal ions are present, hydrogen gas will be produced
if the metal ions form an elemental metal that is more reactive than hydrogen (e.g, sodium ions). If the metal ions form an elemental metal that is less reactive than hydrogen (e.g. copper ions), a solid layer of the pure metal will be produced instead.
3) At the anode, if OH- and halide ions (Cl-, Br-, I-) are present, molecules of chlorine, bromine or iodine will be formed. If no halide ions are present, then the OH- ions are discharged and oxygen will be formed

Question 2

How can you test for chlorine?

Answer 2

chlorine bleaches damp litmus paper turning it white

Question 3

How can you test for oxygen?

Answer 3

hydrogen will make a squeaky pop with a lighted splint

Question 4

how can you test for oxygen?

Answer 4

It will relight a glowing splint

Question 5

revise half equations