April 20, 2024, 04:55:08 AM
Forum Rules: Read This Before Posting


Topic: Making a graph, what scale should I use?  (Read 9154 times)

0 Members and 1 Guest are viewing this topic.

Offline Hemidol

  • Regular Member
  • ***
  • Posts: 68
  • Mole Snacks: +2/-2
  • Rune of Punishment
Making a graph, what scale should I use?
« on: September 22, 2009, 08:21:10 PM »
I need to plot of the density vs. Wt. % concentration.

My values of density are:

0.9982
1.0178
1.0381
1.0592
1.0810
1.1036
1.1270

And my weight %:

0.00
5.00
10.00
15.00
20.00
25.00
30.00

I'm having trouble coming up with a scale that will make a nice graph. Does anyone have any ideas for the density scale (what I should start at and go up by)?

Thanks.

Offline Leeple Stays

  • New Member
  • **
  • Posts: 6
  • Mole Snacks: +1/-0
Re: Making a graph, what scale should I use?
« Reply #1 on: September 22, 2009, 10:05:58 PM »
If I were going to do the scale, I'd do the density by .200's and weight percents by 1's or 5's.

Offline Hemidol

  • Regular Member
  • ***
  • Posts: 68
  • Mole Snacks: +2/-2
  • Rune of Punishment
Re: Making a graph, what scale should I use?
« Reply #2 on: September 22, 2009, 10:53:54 PM »
A graph of this nature really doesn't work. Going up by this amount on the densitys just doesn't create a nice line with this data. It's basically a horizontal line.

Can I do this for my density (which is the y-axis).

Start at 0.00 then shoot up to .98 then go to 1.00, then 1.02, then 1.04, etc. etc. is this allowed or is this not allowed when graphing?

Offline billnotgatez

  • Global Moderator
  • Sr. Member
  • ***
  • Posts: 4401
  • Mole Snacks: +223/-62
  • Gender: Male
Re: Making a graph, what scale should I use?
« Reply #3 on: September 23, 2009, 02:44:31 AM »
It is interesting that you have a density of 0.9982 and a weight % of 0.00.

Setting that aside -

I have seen graphs where the x-axis goes from 0.00 to 35.00 by incremented by 5.00 and the y-axis starts at 0.8000 to 1.2000 incremented by 0.0200. Sometimes with zero at the bottom of the y axis and a jagged y-axis line for a short distance to the .8000

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27652
  • Mole Snacks: +1800/-410
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: Making a graph, what scale should I use?
« Reply #4 on: September 23, 2009, 02:56:40 AM »
It is interesting that you have a density of 0.9982 and a weight % of 0.00.

Nothing strange - see http://www.chembuddy.com/?left=FAQ (scroll down the page to water density table).

And honestly I don't understand why there is any problem with making a graph. Start vertical axis at 0.99, go up to 1.13 with 0.01 incremement. (0,0) doesn't have to be included.
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Offline billnotgatez

  • Global Moderator
  • Sr. Member
  • ***
  • Posts: 4401
  • Mole Snacks: +223/-62
  • Gender: Male
Re: Making a graph, what scale should I use?
« Reply #5 on: September 23, 2009, 02:59:22 AM »
@ Borek -- Thanks for the info

Sponsored Links