b) The copper (II) oxide is produced from copper (I) sulfide (Cu2S) by a multistep reaction. After initial grinding, the first step is to heat the ore strongly with oxygen gas to form powdered copper (I) oxide (Cu2O) and gaseous sulfur dioxide (SO2). The copper (I) oxide is then further oxidized to copper (II) oxide. Write the complete multistep balances chemical equation for the reaction. (4 marks) QUESTION 2 (PO1, CO2, C4) a) An acid-base titration experiment was conducted by using Nitric acid, HNO3 and sodium hydroxide, NaOH. Determine the pH when 50mL of 0.1MHNO3 is titrated with 30ml of 0.2MNaOH solution. (6 marks)