IB Chemistry, IB Biology on Uncertainty calculation, error analysis and standard deviation on rate of reaction
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IB Chemistry, IB Biology on Uncertainty calculation, error analysis and standard deviation on rate reaction
![IB Chemistry, Uncertainty, Error Analysis, Standard Deviation Uncertainty Calculation for Rate and Concentration of reaction. Rate = 1/time, Time for X to disappear. ( Iodine Clock Reaction) ,[object Object],[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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IB Chemistry, IB Biology on Uncertainty calculation, error analysis and standard deviation on rate of reaction
- 1. http://lawrencekok.blogspot.com Prepared by Lawrence Kok Tutorial on Uncertainty Calculation, Error analysis and Standard deviation for rate of reaction.
- 8. 2 nd Max/Minimum Method Preparing 0.053M from 0.1M KI using pipette. Pipette uncertainty = ± 0.4 Max Conc KI = Max Vol KI and Min Vol of water used M x V (dil) = M x V (conc) M x (15.8 + 14.2) = 0.1 x (15.8) M = 0.1 x ( 15.8 ) / ( 15.8+ 14.2 ) M = 0.053 Max Conc KI = Max Vol KI + Min Vol water Max Vol KI = 15.8 ± 0.4 = 16.2 Min Vol water = 14.2 ± 0.4 = 13.8
- 9. M x V (dil) = M x V (conc) Max Conc KI = (0.1 x 16.2) / ( 16.2 + 13.8 ) Max Conc = 0.054 Min Conc = Min Vol KI and Max Vol water used Min Vol KI = 15.8 ± 0.4 = 15.4 Max Vol water = 14.2 ± 0.4 = 14.6 M x V (dil) = M x V (conc) M x (15.4 + 14.6) = 0.1 x (15.4) M = 0.1 x ( 15.4 ) / ( 15.4 + 14.6 ) M = 0.051 Min Conc = 0.051 Uncertainty Conc = 0.053 ± ( 0.054 --- 0.051)
- 10. Uncertainty Calculation, 2 fold Serial dilution using 3% H 2 O 2 Two Methods used 1 st % Uncertainty Method For 1.5% : Total % Uncertainty is 1.6%, Answer = 1.5 ± 1.6% Propagation of error involved
- 11. Absolute Uncertainty for 1.5 ± 1.6% = (1.50 ± 0.02)%
- 12. 2 nd Max/ Min Method For 2 fold Serial dilution on 3% H 2 O 2 M x V (dil) = M x V (conc) M x (1.5 +1.5) = 3% x 1.5 M = 1.5%
- 13. Max Conc H 2 O 2 when Min Conc H 2 O 2 when Max Vol H 2 O 2 used = 1.51 Min Vol H 2 O 2 used = 1.49 Min Vol water used = 1.49 Max Vol water used = 1.51 Max Conc H 2 O 2 Min Conc H 2 O 2 M x V (dil) = M x V (conc) M x V (dil) = M x V (conc) M x (1.51 + 1.49) = 3% x ( 1.51 ) M x (1.51 + 1.49) = 3% x ( 1.49 ) M = 3% x ( 1.51 )/ ( 1.51 + 1.49 ) M = 3% x ( 1.49 )/ ( 1.51 + 1.49 ) M = 1.51% M = 1.49% Max Conc = 1.51% Min Conc = 1.49% Uncertainty Conc H 2 O 2 = 1.50 ± (1.51%---1.49%)
- 15. Average Rate by taking average for 3 trials Uncertainty for Rate = Standard deviation Use Excel to calculate Std deviation Average rate = (0.113 ±0.015)kPa/s
- 16. Click HERE to view video on how to insert error bar or standard deviation in Excel
- 17. Acknowledgements Thanks to source of pictures and video used in this presentation Thanks to Creative Commons for excellent contribution on licenses http://creativecommons.org/licenses/ Prepared by Lawrence Kok Check out more video tutorials from my site and hope you enjoy this tutorial http://lawrencekok.blogspot.com