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November 22, 2014

November 22, 2014

Posted by **Ken** on Sunday, November 27, 2011 at 3:49pm.

I know I'm suppose to use Beer's law to help solve this, but I'm not sure exactly how to start this problem. Answer is 2.19 x 10^-4 M

- Chemistry -
**DrBob222**, Sunday, November 27, 2011 at 4:16pmThe reference(which I'm calling the standard) sample is 6.8E-4M and 10.00 mL is diluted to 50.0 mL. So the reference standard is 6.8E-4M x (10.0 mL/50.0 mL) = ?M

Lstd x M std = Lsample x Msample

1.00cm x ?M std = 2.48cm x M sample

Solve for M sample.

Then look to see how the sample was treated. You had a 25 mL sample to which the Fe^3+ was added, then diluted to 100; therefore, the M of the sample in the cuvette must be multiplied by (100/25). I agree with the answer.

Post your work if you get stuck.

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