Lab 1 Report

Lab 1 Report - Investigation # 31 Why Is the Vinegar...

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Unformatted text preview: Investigation # 31 Why Is the Vinegar Factory Rusting? Investigation Team Members: Group 1: Shuangchao Ma, Albert Hsia, John Thompson. 4/16/2007 Introduction: The rust problem is currently commonly seen in both production facilities and normal human lives. Although oxygen gas concentration will affect this issue, it is also important to understand more about the chemistry and mathematical relationships involved in it. In this experiment, a method for measuring gas changes to simulate the rusting needs to be developed. The Rate Law was used to represent the dependence of the rate on the concentration and pressure. To make the changes easily measured, a function of change between the presence of acetic acid and the pressure, instead of concentration, will be investigated. Three different kinds of plots will be set up for three repeated trials, so that the relationship between pressure and time can be discovered. The linear one will be selected to determine the order of reactions, and a certain way to deal with the rust problems will be discussed in the discussion part. Following equations were used or related: (1) Rate = k[A] a [B] b [C] c (2) P = P final + kt (3) P – P final = P intial – P final- kt (4) ln(P – P final ) = ln(P initial – P final ) – kt (5) 1/(P – P final ) = 1/(P initial – P final ) + kt Experimental: Materials The materials used are shown below: Equipment Quantity Flask and Cylinder As Needed Balance 1 Manometer 1 25ml Syringe with Connectors 1 Tygon Tubing As Needed Tissues As Needed 50ml Flask with One-hole Stopper Fitted with Dropper Tube 1 125ml Flask with One-hole Stopper Fitted with Dropper Tube 1 Crucible Tong 1 Material Amount Steel Wool As Needed 5% Acetic Acid Solution As Needed Procedure Primarily the weight of the steel wool was measured. It was selected in a range [1.0g, 2.0g] and the data was recorded. The manometer was then connected with the one-hole stopper on the flask properly. A crucible tong was used to grab the steel wool. The wool was soaked into the acetic acid completely and transferred into the flask immediately. After the stopper was covered tightly onto the top of the flask, the initial pressure was recorded. A 30 minutes measurement was then set up. The pressure was recorded each minute. This was repeated three more times in the same way and all the data was recorded in the Microsoft Excel forms so that the plots could be made. Only best three of the four trials were plotted....
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This note was uploaded on 04/17/2008 for the course CHM 116 taught by Professor Unknown during the Fall '08 term at ASU.

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Lab 1 Report - Investigation # 31 Why Is the Vinegar...

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