Question:2. A technician added excess aqueous sodium sulphide, Na2S(aq), to 100ml of barium nitrate, Ba(NO3)2(aq). When dried, the precipitation of barium sulphide had a mass of 2.675g (3+4=7 marks) a) Write the chemical equation for the reaction. b) Calculate the conc. in moles per litre, of barium nitrate solution Question:3. Identify the precipitate in the reaction between aqueous iron (III) bromide, FeBr3(aq), and potassium hydroxide, KOH(aq). (2+3=5 marks) a) Show the Chemical equation: d b) Wrtie the net ionic equation for the reaction