Question

2. Answer all parts Describe in detail, using diagrams and reaction equations, what happens when a current of electricity is passed through (i) a solution of potassium chloride (KCI) in water and (i) water containing a little sulphuric acid (H2SO4). (a) [11 marks] (b) Explain why potassium is formed when a current of electricity is passed through fused (molten) potassium chloride but not through a solution of potassium chloride in water as in (a). In the case of fused potassium chloride, determine the mass of potassium (K) and the volume of chlorine gas (Cl2) (at STP) produced by a current of 20 A flowing for 25 min. [5 marks] (c) [9 marks] [1 Faraday = 96,500 C: 1 mole of gas occupies 22.4 L at STP]

Answer 1

loride Anode t) ·リ

an ode clechodo ·ピ When a .rfYcu0んа 외uhom af Potassium chlorile (KU) But ノ 2. or in eeshechemic Series K

50 0 gee The magr -39,1 12.15 2- 2- 41 .048

at STP meo 3.472 L a1STP 3.7 2 1