Sig Figs with Logs

Science questions not covered in Chem 14A and 14B. Try to limit questions to chemistry (inorganic chemistry, physical chemistry, organic chemistry, biophysical chemistry, biochemistry, materials science, environmental chemistry).

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rachelmackenzie3H
Posts: 10
Joined: Fri Jul 22, 2016 3:00 am

Sig Figs with Logs

Postby rachelmackenzie3H » Mon Jan 30, 2017 8:21 am

Can anyone give a clear explanation of how many sig figs to use with logarithms? I am kind of confused by the information in the course reader.

Alexandria_Leaf_2F
Posts: 30
Joined: Fri Jul 15, 2016 3:00 am

9.59 Textbook

Postby Alexandria_Leaf_2F » Mon Jan 30, 2017 8:29 am

in 9.59b, the dissolution of CaF2 I'm water is: CaF2(s)---->CaF2(aq) technically this is increasing the disorder of the system and should have a positive entropy (positive delta S), but the solutions manual shows it to have a negative entropy. Why is that?

Amir Patel 1G
Posts: 20
Joined: Wed Sep 21, 2016 2:59 pm

Re: Sig Figs with Logs

Postby Amir Patel 1G » Mon Jan 30, 2017 10:01 am

The course reader uses "mantissa" when explaining sig figs for logarithm problems. This term refers to the digits after the decimal point, so since 10^2.18 has 2 sig figs after the decimal point, there will be 2 sig figs in the final decimal answer written in scientific notation, 1.5x10^2.


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