Redox

Report of chemistry experiment on redox titration locution up: Beverly Wong 6S (26) Date: 28-10-2010 An analysis of contract tables 1. Objectives To find let on the essential percentage of adjure (?) ions are in a peculiar(prenominal) brand of agitate tables and compare the result with the quantity claimed by the producer. 2. Introduction of the experiment Iron tables usually contain bid (?) 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 dark-brown and Mn2+ ion is tintless. MnO4- ion has a very deep purple colour when it opposes wi th Fe2+ ion, it develop 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 resolving afterward the response 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 bust 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 fightion of Fe2+ ions and MnO4- ions. Sulphuric acid can al so provide an virulent modal(a) to Fe2+ io! ns. 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 attached 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 well(p) essay, order it on our website: OrderEssay.net

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