Ch3 - Quantitative Chemical Analysis Chapter 3:...

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Quantitative Chemical Analysis Quantitative Chemical Analysis Chapter 3: Experimental Error Experimental Error
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2 Significant Figures How many significant figures (sig figs)? 0.000342 0.03420 0.342 3.42 342000 ? Ambiguous Could be 3.42 x 10 5 3.420 x 10 5 3.4200 x 10 5 3.42000 x 10 5 So, use scientific notation. In any arithmetic calculation, the answer has the number of sig figs of the number in the calculation with the fewest sig figs.
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3 Sig Figs for Log, Ln, 10 x and e x A logarithm 2.486 mantissa characteristic Number of sig figs in the anti-log is the number in the mantissa Log (2.5 x 10 3 ) = 3.39 8 = 3.40 10 3.407 = 2.55 27 x 10 3 = 2.55 x 10 3 Ln (6.73 x 10 4 ) = 7.303 77 = 7.304 e 7.3038 = 6.729 766 x 10 4 = 6.730 x 10 4
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4 Types of Error Systematic aka determinate Random aka indeterminate Systematic : from flaws in equipment design of experiment machine setting error in reagent strength wrong temperature consistent, reproducible These errors can be found and corrected
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Ch3 - Quantitative Chemical Analysis Chapter 3:...

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