Write out equations for the reactions involved in this titration

1 obse Redox back titration acid Calculate the concentration of H2O2 in g dm in the original stock solution (5) Why did you add the sulphuric acid before titrating with permanganate? r Part 2 Determination of the concentration of a H2O2 solution using thiosulphate solution (you need accurate value of concentration)(approx. 0.1M). sition) tal Pipette 10 cm of the original stock H2O2("10 vol") solution into a 250cm volumetric flask and make up with distilled water. Label this as solution B. Pipette 25 cm of this solution into a solution containing 1g of Kl in 25 cm3 of 4 M H2SO4 and 25 cm of water with constant stirring. Allow to stand for 15 min. Titrate the liberated iodine with Na2S2O3 (0.1 M) as follows (x 3 times): se cid. The aine Titrate until the blue-black colours turns pale yellow. Add approx. 3-4 drops of starch solution, [3 or so drops should suffice) and continue titrating until the dark-blue colour has almost faded. Add 10cm of 15 % potassium thiocyanate solution. The dark blue colour returns. Titrate to a colourless end-point, (take care not to over titrate). Repeat titration to obtain agreeing titre values to within 0.1 cm3 4