October 10, 2015

Homework Help: Chemistry

Posted by Ken on Monday, December 12, 2011 at 10:52pm.

A blood serum sample containing Na+ gave an emission signal of 4.27 mV. A small volume of concentrated standard Na+ was then added to increase the Na+ concentration by 0.102 M, without significantly diluting the sample. This "spiked" serum sample gave a signal of 8.09 mV. Find the original concentration of Na+ in the serum.

Answer is suppose to be 0.117 but I'm just not getting those numbers.

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