Redox

Report of chemistry experiment on redox titration
look up: Beverly Wong 6S (26)
Date: 28-10-2010

An analysis of iron tables

1. Objectives
To find out the essential percentage of iron (?) ions are in a peculiar(prenominal) brand of iron tables and compare the result with the quantity claimed by the producer.

2. Introduction of the experiment
Iron tables usually contain iron (?) sulfate which is soluble in water. Assuming all the iron in the tables is in the form of iron (?), Fe2+. The amount of iron canister be estimated by titrated iron (?), Fe2+ (aq) against potassium permanganate, KMnO4. In the titration, Fe2+ ions reply with MnO4- ions and H+ ions according to the following equation:

MnO4- (aq) + 8H+ (aq) + 5Fe2+ (aq) ( Mn2+ (aq) + 4H2O(1) +5Fe3+ (aq)

MnO4- ion is purple, Fe2+ ion is green, Fe3+ ion is brown and Mn2+ ion is colourless. MnO4- ion has a very deep purple colour when it opposes with Fe2+ ion, it become colourless. Fe2+, Fe3+ and Mn2+ ions mystify a pale colour. Therefore, the end point of the titration is the appearance of tenacious purple colour. (One extra drop of potassium permanganate is added to the solution afterward the reaction is complete.)
Activated charcoal is added to the dissolved iron tablets solution.



The actuate charcoal can remove the red colour which comes from the outmost coating of the tablets. The red colour can interrupt the appearance of the end point and so disturb the result.
sulphuric tart is added to dissolve the iron tablets and to provide H+ ions to the reaction of Fe2+ ions and MnO4- ions. Sulphuric acid can also provide an acidic modal(a) to Fe2+ ions. If water is add to dissolve iron tablets, the Fe2+ ions will react with OH- ions to form Fe(OH)2 (s).

3. Procedures
1. Weight accurately of 5 iron tablets (to the nigh 0.001g) and take record of the measurement.
2. Dissolve the 5 iron tablets in about 100 cm3 of 1.0M sulphuric acid in a conical flask.
3. Stir to dissolve...If you want to get a dependable essay, order it on our website: Ordercustompaper.com



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