Posted by **jen** on Saturday, April 2, 2011 at 5:12pm.

can someone please explain to me in dummy language this question... Why is the graph of transmittance versus concentration not linear?...

Thankyou very much

- chemistry -
**DrBob222**, Saturday, April 2, 2011 at 5:47pm
I suppose the easiest way to look at that absorbance = A = abc and that is a linear graph. But A = log (1/T) so the graph of T versus concn can't be linear because it is a log term.

- chemistry -
**bobpursley**, Saturday, April 2, 2011 at 5:51pm
In dummy language, it is not linear because it is logarithmic by definition.

absorbance=constant*concentration=kc

which is linear with concentration.

but absorbance=10*log P/Po=

=10log 1/Transmittance

because transmittance=P/Po

which leads to T=e^{-k*concentration}

Thus, it is not linear.

http://teaching.shu.ac.uk/hwb/chemistry/tutorials/molspec/beers1.htm

- chemistry -
**nada**, Tuesday, October 2, 2012 at 12:26pm
why is the hydrous copper sulfate heated to constant weight?

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