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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: meghan on November 09, 2009, 06:28:58 AM

Title: How do I extrapolate the linear portion of the curve to find T[sub]f[/sub]
Post by: meghan on November 09, 2009, 06:28:58 AM

I am given a chart listing temperature and time. 

Time (min)     Temp (Celsius)
0.0               23.3
1.0               27.8
2.0               28.4
3.0               28.5
4.0               28.5
5.0               28.4
6.0               28.3
7.0               28.3

I graphed the time and temperature (on good old graph paper).  My next step is to "extrapolate the linear portion of the graph and determine T_f."  I also need to solve for :delta: T.  This is a pre-lab question so there is no other information provided.  I'm really lost on what to do for this.  This material is from Chapter 8 and we're only on Chapter 6 and I can't seem to find further direction from my text. 

I appreciate any guidance on how to move forward.  Thank you so much in advance!   

Title: Re: How do I extrapolate the linear portion of the curve to find T[sub]f[/sub]
Post by: BetaAmyloid on November 11, 2009, 11:04:01 PM

You have to calculate a line of best fit or through using statistics by a LSRL (Least Squares Regression Line). It is an approximate calculation, so in your lab report, be sure to say that the graph is extrapolated and therefore theoretical.