Learning objective: WALT: perform titrations using acidified potassium manganate (VII) WILF: the mass of iron in an iron tablet 15/06/2018 Iron is an.

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Presentation transcript:

Learning objective: WALT: perform titrations using acidified potassium manganate (VII) WILF: the mass of iron in an iron tablet 15/06/2018 Iron is an essential mineral in the human body – most conspicuously its role in haemoglobin Most people gain sufficient iron from their diet but some need supplements in the form of iron (II) sulfate (ferrous sulphate) Titration against acidified potassium manganate (VII) can be used to find the amount of iron (II) (Fe2+) in the tablets

The principle Complete the half equations and combine them to produce an equation for the reaction between iron (II) and manganate (VII) MnO4- + 8 H+ + 5 e- ⇋ Mn2+ + 4 H2O 5 Fe2+ ⇋ 5 Fe3+ + 5 e- MnO4- + 8 H+ + 5 e- + 5 Fe2+  Mn2+ + 4 H2O + 5 Fe3+ + 5 e-

The method Weigh five iron tablets, then dissolve them in about 100 cm3 1.0 moldm-3 sulfuric acid in a conical flask – this might require gentle warming Why minimise the heating? Why use sulfuric acid? The outer coating is insoluble so filter the solution into a beaker – rinsing the flask to ensure all of the iron (II) sulfate is transferred Transfer the solution into a 250.0 cm3 volumetric flask – rinsing the beaker into volumetric flask and make up to the mark

What goes where? Potassium manganate (VII) is very dark The potassium manganate (VII) is put into the burette: Advantages: Disadvantages:

Method Pipette 25.0 cm3 iron (II) solution into the flask Add about 25 cm3 sulfuric acid and titrate with 0.01 moldm-3 potassium manganate (VII) Repeat until you have two concordant titres

Calculation Calculate your mean titre to the nearest 0.05 cm3 Calculate the amount of MnO4- added Calculate the amount of Fe2+ in a 25.0 cm3 sample Calculate the total amount of Fe2+ in the original tablets Calculate the mass of: Iron (Fe) Iron (II) sulfate FeSO4 Iron (II) sulfate heptahydrate (FeSO4.7H2O) Which species is used by the manufacturer?

For a later lesson… Weigh accurately between 2.5 and 3 g of brass Place the brass in a 250 ml beaker in the fume cupboard Add about 20 cm3 concentrated nitric acid and enjoy the show…