• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

The Estimation of Iron (II) and Iron (III) in a Mixture Containing Both.

Extracts from this document...


A2 - The Estimation of Iron (II) and Iron (III) in a Mixture Containing Both Planning:- Fe2+ Fe3+ + e- (multiply by 5) MnO4- + 5e- + 8H+ Mn2+ + 4H2O MnO4- + 8H+ + 5Fe2+ Mn2+ + 5Fe3+ + 4H2O Background Knowledge - Iron, Fe, is a transition metal with the atomic number 26. Iron is a magnetic, malleable and metallic silver element. Iron has the ability of having multi valences, commonly Fe2+ or Fe3+. Fe2+ forms ferrous compounds, whereas Fe3+ tends to form ferric compounds. Iron can be used as a catalyst due to its multiple valances, e.g. it is used in the manufacturing of Ammonia in the Haber process. An oxidising agent will convert Iron(II) into Iron(III), the iron will lose an electron. A reducing agent will convert Iron(III) into Iron(II), the iron will gain an electron. Iron sulphate (FeSO4), also known as vitriol or copperas, is an important iron (II) compound as it forms pale green crystals containing seven molecules of water of hydration. It is mainly formed as a by - product in the pickling of iron. It can be used as a mordant in dyeing, tonics in medicines and also in the manufacturing of ink and pigments. Iron (III) compounds also have many uses, such as iron (III) oxide being used as a pigment, known as iron red, or the compound is also used as a polishing abrasive, known as rouge. ...read more.


Once cleaned, you must pipette 25cm3 of the iron solution into the conical flask. You must touch the end of the pipette on the conical flask to maintain accuracy throughout the experiment. o Into the conical flask you must add roughly 20cm3 of sulphuric acid as acidified acidic solution is the requirements for which this reaction may take place. o Fill the burette with KMnO4 using the burette filler, but be sure to remove the funnel as drops later on in the experiment may ruin results. o Now you are setup to begin titrating. Allow the potassium permanganate to flow into the titre until a permanent colour change from colourless to pink has occurred. This is your rough titration. Record your value of your burette and fill in the table below. o Repeat this procedure until you have concurrent titre volume readings i.e. your values must be within 0.1cm3 of each other. But, this time, allow the KMnO4 to flow into the solution until you are near the value you received for your rough titre. At this point you must drip the KMnO4 into the solution in the conical flask to increase the accuracy of your readings. o Throughout the whole period of titrating, you must constantly be swirling the conical flask to make sure that the colour change is permanent. o Keep all the conical flask solutions as they will be used in titration 2. ...read more.


in solution = Moles x RFM = (8.0 x 10-4).W x 55.8 = 4.5 x 10-2.W g ( Q ) Overall, the mass of Iron (III) present is the difference between the mass of Iron (II) in titration 2 and titration 1: = H - D = ( 4.5 x 10-2 )( W - V ) g ( Z ) Percentage Composition: Iron (II) : ( Mass of Iron (II) in titration 1 / Mass of Iron (II) in titration 2 ) x 100 = P / H x 100 Iron (III) : ( Mass of Iron (III) / Mass of Iron (II) in titration 2 ) x 100 = Q / H x 100 Safety * Goggles must be worn at all times while working with chemicals. * Lab coats must be worn at all times potassium permanganate stains clothes. * Wear gloves when handling sulphuric acid as it is corrosive and toxic. * Safety fillers must be used when using pipettes. * If any chemical comes into contact with your skin, you must immediately wash the area thoroughly. * Glass equipment must be handled carefully as breakages are possible. in the event of a cut, it should be seen to before continuing the practical. Sources * Chemistry in Context Fourth Edition - Graham Hill and John Holman * Microsoft Encarta 2000 Encyclopedia * Chemistry 2 textbook - OCR * Compton's Encyclopedia 2001 Edition Jaimal B Amin A2 Practical Exp 9 Mr. Latif ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Aqueous Chemistry section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Aqueous Chemistry essays

  1. Marked by a teacher

    The Haber Process

    3 star(s)

    will be, the rate is only fast up to the pressure of 200 atmosphere. The Haber Process is used in industry, the greatest demand of this process is Ammonium production. Ammonia is used as a fertiliser mainly for farming, an advantage of this is that most of the Ammonia is

  2. Synthesis of Iron (II) Sulphate FeSO4

    For about 1 day later, we will find out some nice formed crystals appear at the bottom of the bottle Advantages

  1. Separating the compenents of a mixture

    it was then returned to the bench for use in the next step. * The filter funnel was then clamped using the metal clamp stand above the 250cm3 evaporating basin. * The mixture in the 500cm3 beaker was then poured through the filter into the evaporating basin.

  2. Determining the purity of Iron Wool.

    dm-3 Fe2+ in 1 liter to work out the amount in 250cm3: 4.154868/4= 1.038717 g of Iron in a 250cm3 sample The percentage this value against the original mass of Iron Wool used: (1.038717/1.40)x 100 = 74.19407143 the percentage purity of the experimental sample of Iron wool was: 74.20% CONCLUSION

  1. The basic aim of this experiment is to determine the percentage concentration of Iron ...

    A concentration of 0.01 M ensures that the acid contains a high concentration of hydrogen ions, and yet dilute enough not to interfere with the end calculations by acting as an oxidising agent. Hazards and Safety Precautions Both the Sulphuric acid and Potassium Manganate are toxic and corrosive; therefore a

  2. Devise a volumetric procedure to determine the percentage of Iron(II) and Iron(III) in a ...

    is reduced to Iron(II) could be calculated using the approximate concentration of iron solution and the mole ratio found in the equation. For the first titration in which the Iron(II) is reacting an approximate percentage composition will need to be found, which will allow the same concentration of Potassium Manganate to be used.

  1. How much Iron (II) in 100 grams of Spinach Oleracea?

    and trying to work out the concentrations of solutions and thus it will be important to know the molar mass (Mr) of the substances that I will be using. The molar mass of a substance is the mass of that substance, which contains 1 mol of that substance.

  2. copper practical

    The dry ore is mixed with sand. The word equation of this reaction is as follows: CuFeS2+ 5O2+2SiO2 2Cu2S,FeS + 2FeSiO3+ 4SO2 2) The matte and lag are tapped off separately. Sulphur dioxide is used to create sulphuric acid. 3) Air and sand is reacted with matte.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work