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Topic: Determining concentration from best fit line???  (Read 2435 times)

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Offline 93suzzzykim

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Determining concentration from best fit line???
« on: February 02, 2017, 01:04:08 AM »
Given the following data where an increasing amount of Sr was added to the same vial of unknown, determine the amount of strontium in ppm in the unknown. The equation of the best fit line is y=3.136x+27.36 for a plot of [Sf] vs. signal.

maybe this equation may help..?
Cx= b*Cs / m*Vx

Offline Borek

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Re: Determining concentration from best fit line???
« Reply #1 on: February 02, 2017, 03:51:49 AM »
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Offline Arkcon

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Re: Determining concentration from best fit line???
« Reply #2 on: February 02, 2017, 05:54:13 AM »
maybe this equation may help..?
Cx= b*Cs / m*Vx

Like Borek: said, if you know x and y of the equation, you can solve it.  This offered equation doesn't help -- we can see b and m, but we don't know what Cx, Cs, Vx mean. We know =you're trying to find concentration from a signal, but we don't have an unknown signal.  See if you can figure this out for yourself along these lines.
Hey, I'm not judging.  I just like to shoot straight.  I'm a man of science.

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