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The lithium concentration in serum taken from a patient being treated with lithium for manic-depressive illness was analyzed

using flame emission spectroscopy. A sample of the serum gave a reading of 305 units for the intensity of the 671 nm red

emission line. Then, 1.00 mL of a 11.3 mM lithium standard was added to 9.00 mL of serum. This spiked serum gave an

intensity reading of 789 units at the 671 nm emission line. What is the original concentration of Li* in the serum?

[Lit] =

Qu

mM