# Ch3 - Quantitative Chemical Analysis Chapter 3 Experimental...

This preview shows pages 1–5. Sign up to view the full content.

Quantitative Chemical Analysis Quantitative Chemical Analysis Chapter 3: Experimental Error Experimental Error

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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.
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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 8

Ch3 - Quantitative Chemical Analysis Chapter 3 Experimental...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online