Titration
Aim To prepare a standard iron (II) solution To determine the concentration of potassium permanganate solution
Instructions Preparation of Standard Iron (II) Solution 8g of hydrated iron (II) ammonium sulfate is weighed accurately using a 50mL beaker. The salt is transferred to a 250mL volumetric flask using a filter funnel, washed down with distilled water. The container is rinsed carefully and the rinsing is added to the volumetric flask. 100mL of water is added slowly to the volumetric flask, followed by 5mL of concentrated H¬2SO4. It is stoppered, shaken well and made up to the mark with distilled water.
Standardizing Potassium Permanganate Solution The potassium permanganate is placed in the burette and the initial reading is recorded. 25mL of Fe(II) solution is pipetted from a correctly rinsed beaker into a 250mL conical flask. 10mL of 2M H2SO4 is added using a measuring cylinder. It is titrated until the end point and the final reading is recorded. The second reading is recorded in the usual manner. The experiment is repeated to obtain concordant results. (Titre highest - Titre lowest ≤ 0.10mL) The concentration of the KMnO4 solution is calculated in molL-1. A full report is written for this experiment: Title, aim, procedure, data recorded, calculation and results, discussion (random error source and minimization explained; possible systematic error source identified and detection explained) and conclusion.
Data recorded Preparation of Standard Iron (II) Solution
Mass of Fe(NH4)2(SO4¬)2.6H2O weighed = 8.00g
Molar mass of Fe(NH4)2(SO4¬)2.6H2O = 392.13gmol-1
Volume of Fe(II) solution prepared = 0.250L
Standardizing Potassium Permanganate Solution
Stated concentration of KMnO4 (aq) on container = 0.02mol
Volume of Fe(II) solution pipetted for titration = 25.0mL
Burette Reading (mL) Titration Numbers 1 2 3 4 5
Final 24.40 25.00 49.30 23.80 47.50
Initial 0.00 0.00 25.00 0.00 23.80
Titre 24.40 23.80
Instructions Preparation of Standard Iron (II) Solution 8g of hydrated iron (II) ammonium sulfate is weighed accurately using a 50mL beaker. The salt is transferred to a 250mL volumetric flask using a filter funnel, washed down with distilled water. The container is rinsed carefully and the rinsing is added to the volumetric flask. 100mL of water is added slowly to the volumetric flask, followed by 5mL of concentrated H¬2SO4. It is stoppered, shaken well and made up to the mark with distilled water.
Standardizing Potassium Permanganate Solution The potassium permanganate is placed in the burette and the initial reading is recorded. 25mL of Fe(II) solution is pipetted from a correctly rinsed beaker into a 250mL conical flask. 10mL of 2M H2SO4 is added using a measuring cylinder. It is titrated until the end point and the final reading is recorded. The second reading is recorded in the usual manner. The experiment is repeated to obtain concordant results. (Titre highest - Titre lowest ≤ 0.10mL) The concentration of the KMnO4 solution is calculated in molL-1. A full report is written for this experiment: Title, aim, procedure, data recorded, calculation and results, discussion (random error source and minimization explained; possible systematic error source identified and detection explained) and conclusion.
Data recorded Preparation of Standard Iron (II) Solution
Mass of Fe(NH4)2(SO4¬)2.6H2O weighed = 8.00g
Molar mass of Fe(NH4)2(SO4¬)2.6H2O = 392.13gmol-1
Volume of Fe(II) solution prepared = 0.250L
Standardizing Potassium Permanganate Solution
Stated concentration of KMnO4 (aq) on container = 0.02mol
Volume of Fe(II) solution pipetted for titration = 25.0mL
Burette Reading (mL) Titration Numbers 1 2 3 4 5
Final 24.40 25.00 49.30 23.80 47.50
Initial 0.00 0.00 25.00 0.00 23.80
Titre 24.40 23.80