Lab Report Mn-Steel

Determination of manganese in Steel Submitted by - Date of Submission 27. 03. 11 Objectives In steel production aside the entreat, which is the primary source, some amounts of manganese is apply together with carbon. The objective of this experiment is determining the manganese amount in the steel compound by using UNICAM UV-VIS Spectrometer. Theory Many molecules tie ultraviolet or visible light. The absorbance of a antecedent increases as attenuation of the beam increases.Absorbance is directly proportional to the path length, b, and the concentration, c, of the absorbing species. Beers Law states that A = ebc, where e is a constant of proportionality, called the absorptivity. Different molecules absorb radiation of contrastive wavelengths. An absorption spectrum will show a number of absorption bands correspond to structural groups within the molecule. In this experiment wavelength range between 400-650nm is employ in order to detect in the visible range. Steel is an allo y primarily composed of iron with carbon content between 0. 2% and 1. 7% by weight. 1. 5% manganese is whitethorn be apply too, to provide adjunctal strength for a modest price increase. hundred and other elements act as a hardening agent, preventing dislocations in the iron atom crystal lattice from sliding past one another. manganese is essential to iron and steel production by virtue of its sulfur-fixing, deoxidizing, and alloying properties. In order to detect the manganese amount in the compound KIO4 is utilize to oxidize Mn+2 to Mn +7 since Mn+2 does not absorb in the visible region therefor cannot be detected.Tungsten lamp is used in the experiment to reach the range between 400-650nm. later on the beam comes from the tungsten lamp, it passes through the monocromator to reach the wavelength range which was selected to find the maximal wavelength. After the light passes through the monocromator it goes through the cuvette and then the detector. The cuvette is made of c rystallization in order to pass the visible light whereas a grump cuvette would absorb it. The Redox Reaction 5 IO4 + 2 Mn2+ + 3 water ? 2 MnO4 + 5 IO3- + 6 H+ Reagents KMnO4 KIO4 H3PO4 Unknown SolutionDeionized Water mechanism Pipette Beaker Heater UNICAM UV-VIS Spectrometer Quartz Cuvette Volumetric Flask Calculations incubus of KMnO4 0. 09149g Weight of KIO4 0. 40807g emax 525nm Absorbance for the unknown 0,415 pic Conclusion I Qualitative and or decimal identification II Error discussion While at the addition step of H3PO4 after 5ml of H3PO4 is pipetted, it was transferred into a volumetric cylinder, and then transferred into the unknown solution and the blank solution. There may have been material loss during the process.Dilution errors may have been done during the dilution process. There may be some individualised errors made while weighing the compounds Any scratch, stain or reproduce left on the cuvette may cause a shift from the hi-fi wavelength in the detected value. If any bubbles left in the cuvette while the contracting is made will as well as cause unseasonable wavelength value. Reference http//teaching. shu. ac. uk/hwb/chemistry/tutorials/molspec/uvvisab1. htm http//www. kimya. boun. edu. tr/webpages/courses/chem308/Determination%20of%20Manganese%20in%20Steel. pdf