Chem Lab 12

# Chem Lab 12 - Date Performed Date Submitted Instructor Chen...

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02/03/10 Name: Gianna Grassilli Date Submitted: 02/10/10 Partner: Kim Meloy Instructor : Chen Qian Chemical Reaction Rate Objective The purpose of this experiment is to measure the decrease in concentration of a hydrogen peroxide (H 2 O 2 ) solution as it is decomposing. Experimental Data Table A Time (min.) Volume of KMnO 4 (mL) 1 6.4 6 5.7 11 5.1 16 5.0 21 4.8 31 4.1 41 4.0 51 3.5 61 3.1 *This data simply shows the amount of potassium permanganate added to the reaction mixture in certain intervals over a certain period of time. Sample Calculations Moles of KMnO 4 = (V KMnO4 )(0.063 M) = moles of KMnO 4 (0.0064 L)(0.063 M) = 4.03x10 -4 mol KMnO 4 Moles of H 2 O 2 = (5/2)(moles of KMnO 4 ) (5/2)(4.03x10 -4 mol KMnO 4 ) = 0.001 mol H 2 O 2 Molarity of H 2 O 2 = (moles of H 2 O 2 ) / (0.0100 L H 2 O 2 ) (0.001 mol H 2 O 2 ) / (0.0100 L H 2 O 2 ) = 0.10 M H 2 O 2 ln[H 2 O 2 ] = ln[1.01] = -2.29 t ½ = ln[0.10 M H2O2/2] = -2.99 M = 55 mins. Rate Constant (k) = 0.693/t

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Chem Lab 12 - Date Performed Date Submitted Instructor Chen...

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