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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: whitefloss on February 27, 2019, 11:04:14 PM

Title: Uncertainty calculation (Help Please!)
Post by: whitefloss on February 27, 2019, 11:04:14 PM

1.0 x (0.01000 +/- 0.00002) = ?

I'm not sure how many sig figs the final answer should be because the question has 2 sig figs (1.0M) but then the uncertainty is 0.00002 and the last digit of the final answer needs to be in the same digits place as the uncertainty.

Title: Re: Uncertainty calculation (Help Please!)
Post by: Borek on February 28, 2019, 02:52:11 AM

If the uncertainty of 1.0 M is not given you have to assume the value is something between 0.95 and 1.04(9) (as these will be all written as 1.0). That means uncertainty of 1.0 is around ±0.05 and much, much higher than the uncertainty of the other number.