Significant Figures

Moderators: Chem_Mod, Chem_Admin

Michael Du 1E
Posts: 117
Joined: Sun Sep 22, 2019 12:16 am

Significant Figures

Postby Michael Du 1E » Sat Jan 11, 2020 10:14 am

When we are asked to find the equilibrium concentrations and are given the initial concentrations and K constant, would our equilibrium concentrations follow the significant figures of the initial concentrations or the K?

Hui Qiao Wu 1I
Posts: 56
Joined: Fri Aug 30, 2019 12:16 am

Re: Significant Figures

Postby Hui Qiao Wu 1I » Sat Jan 11, 2020 10:49 am

I would say consider both the K constant and initial concentrations because you used both pieces of information in order to figure your answer. Sig figs are determined by all the numbers you used in a problem.

Rebekah Alfred 1J
Posts: 102
Joined: Thu Jul 11, 2019 12:15 am
Been upvoted: 1 time

Re: Significant Figures

Postby Rebekah Alfred 1J » Sat Jan 11, 2020 11:32 am

Typically, you see what value in the question has the least amount of significant figures to determine how many significant figures your answer will need to be rounded to, which means you consider both the K constant and the initial concentrations.

Robert Tran 1B
Posts: 118
Joined: Thu Jul 11, 2019 12:15 am

Re: Significant Figures

Postby Robert Tran 1B » Sat Jan 11, 2020 1:09 pm

Both the K constant and the initial concentrations should be used when calculating sig figs because they are both used in the overall calculation.

Donavin Collins 1F
Posts: 66
Joined: Sat Sep 14, 2019 12:16 am

Re: Significant Figures

Postby Donavin Collins 1F » Sat Jan 11, 2020 3:05 pm

From my knowledge, the sig figs would be based off of the initial concentration and k constant.

Madelyn Romberg 1H
Posts: 102
Joined: Tue Oct 02, 2018 12:16 am

Re: Significant Figures

Postby Madelyn Romberg 1H » Sat Jan 11, 2020 3:09 pm

It could be either. Sig figs are based off of the smallest number of sig figs initially measured.

Michael Du 1E
Posts: 117
Joined: Sun Sep 22, 2019 12:16 am

Re: Significant Figures

Postby Michael Du 1E » Sat Jan 11, 2020 9:46 pm

Hui Qiao Wu 1I wrote:I would say consider both the K constant and initial concentrations because you used both pieces of information in order to figure your answer. Sig figs are determined by all the numbers you used in a problem.

That's what I initially thought too but there were some problems where the k had 2 sig figs and the initial concentrations had 3. However, the answers of the equilibrium concentrations follow the sig figs of the initial (3).

Osvaldo SanchezF -1H
Posts: 122
Joined: Wed Sep 18, 2019 12:21 am

Re: Significant Figures

Postby Osvaldo SanchezF -1H » Sun Jan 12, 2020 1:13 am

I don't know if it counts for anything but my T.A. said that there is not such a huge emphasis in sig figs this quarter and the processes are much more important so there is no need to stress about it as much like last quarter.

VioletKo3F
Posts: 103
Joined: Sat Sep 07, 2019 12:18 am

Re: Significant Figures

Postby VioletKo3F » Sun Jan 12, 2020 2:19 am

You would have to take into consideration all the numbers you used in the calculation of the k value. Just use the numbers given to you in the question to determine your sig figs.


Return to “Equilibrium Constants & Calculating Concentrations”

Who is online

Users browsing this forum: No registered users and 3 guests