Please help ASAP! Need to know how to solve/answers! Prelab: Green Crystal Analy
ID: 1008551 • Letter: P
Question
Please help ASAP! Need to know how to solve/answers! Prelab: Green Crystal Analysis Lab Iron supplements contain soluble iron(I salts to replenish them in the human body in case of deficiency. Iron is an essential mineral used in many functions, specifically in the transport of oxygen. Iron deficiency can occur through poor diet, or as a consequence of blood loss through menstruation or injury. There are two different ways the amount of iron(II) ion could be determined by titration. Titration #1 : Oxidation/Reduction Titration 1) The iron tablet was placed in 250 mL beaker and dissolved and then that solution was placed in a burette. 2) 25.00mL of a 0.0100 M solution was placed in an Erlenmeyer flask and titrated until the pink color disappeared. Finish the table below Trial Initial mL Final Volume used 28.20 27.95 27.90 20.00 30.05 0.00 average The reaction occurring is: MnO4 (aq) + 8H'( ) + 5Fe2+(aq) Mn2+(aq) + 4H2O() + 5Fe3+(aq) 3) Is iron being oxidized or reduced? Why? Using the average volume in the table, the molarity of the KMnO4 and the above equation, calculate the mg of iron (II) ion that was in the tablet. 4)Explanation / Answer
3) from the reaction : iron is oxidised. because it is loosing electrons
1 mol MnO4- = 5 mol Fe^2+
4) average volume = (28.2+27.95+27.9)/3 = 28.01 ml
No of mol of Fe2+ reacted = 25*0.01/1000 = 0.00025 mol
No of mol of MnO4- reacted = 0.00025 mol
molarity of MnO4- = 0.00025/0.02801 = 0.009 M