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The Estimation Of Iron(II) And Iron(III) In A Mixture Containing Both

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Introduction

The Estimation Of Iron(II) And Iron(III) In A Mixture Containing Both Iron is a transition element; a transition element is an element that forms at least one ion with a partially filled d subshell. All transition elements may be found in a variety of oxidation states, for example iron exists as both as Iron(II) and Iron(III). Transition elements can react with both oxidising and reducing agents. 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. # Working out the percentage composition of the iron ions will require two separate titrations. One of the titrations will react with only one of the ions and the other to react with the whole mixture. To be able to carry out a titration in which all of the mixture will react, a preliminary reaction will need to be done. From previous As practical work I know that Potassium manganate is an oxidising agent and will therefore react with Iron(II) but will not react with Iron(III). This can therefore be used to work out the percentage of Iron(II) present in the solution. ...read more.

Middle

Carefully place the pipette into the pipette filler and place it in the Iron solution. Turn the thumb dial to suck up the solution. Suck up more solution than what is needed, remove the pipette filler and cover the top of the pipette with your index finger and apply pressure. By decreasing the pressure the level of the solution will fall. Carefully allow some of the solution out so that the bottom of the meniscus is in level with the line marked on the pipette. Transfer the solution into the conical flask. Touch the end of the pipette against the inside of the conical flask to release the remaining solution from the pipette. Add about 20cm3 of dilute sulphuric acid to the solution in the conical flask. Place the conical flask on the white tile underneath the jet of the burette. Open the tap of the burette and allow about 2 cm3 of the Potassium Manganate out into the conical flask, then swirl the solution. Repeat this until the solution in the conical flask is almost pink. Slow the flow of Potassium Manganate so that it is coming out drop by drop, swirling the solution all the time. ...read more.

Conclusion

in solution: Moles x Mr = C x 55.8 = H * Mass of Iron(III) present H- D = X The Percentage composition by mass for each ion is therefore: * Iron(II): _D_ x 100 H * Iron(III): _X_ x 100 H Health And Safety* Potassium Manganate: May act as an irritant Harmful by ingestion Sulphuric Acid: Corrosive; will burn Ingestion may be fatal Toxic Copper(II) Sulphate: Harmful by ingestion Potassium Thiocyanate: Harmful by ingestion Irritant; skin contact may lead to ulceration Zinc: Harmful by ingestion May act as an irritant Due to the health risks listed above safety glasses must be warn at all time when working with the chemicals. Lab coats should also be worn to protect clothing and skin should any chemicals be spilt. Care should be taken when heating the solution as chemicals may spit. Tongs should be used at all times when handling the zinc to avoid skin contact. A safety filler should also be used to fill pipettes. If any chemicals come into contact with the skin was effected area immediately with warm water and if necessary seek medical advice Due to the amount of glass apparatus being used, care should be taken when moving around the class. All breakages should be reported immediately. Any cuts should be covered before continuing with practical work. All practical work should be carried out in a well-ventilated area. ...read more.

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