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 283 units for the intensity of the 671 nm red emission line. Then, 1.00 mL of a 11.5 mM lithium standard was added to 9.00 mL of serum. This spiked serum gave an intensity reading of 633 units at the 671 nm emission line. What is the original concentration of Lit in the serum?

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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 283 units for the intensity of the 671 nm red emission line. Then, 1.00 mL of a 11.5 mM lithium standard was added to 9.00 mL of serum. This spiked serum gave an intensity reading of 633 units at the 671 nm emission line. What is the original concentration of Li⁺ in the serum?

\[ \text{[Li⁺]} = \] ______ mM

**Note**: The problem requires calculating the original concentration of lithium ions in the serum using the data from the flame emission spectroscopy readings before and after spiking with a lithium standard.
Transcribed Image Text: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 283 units for the intensity of the 671 nm red emission line. Then, 1.00 mL of a 11.5 mM lithium standard was added to 9.00 mL of serum. This spiked serum gave an intensity reading of 633 units at the 671 nm emission line. What is the original concentration of Li⁺ in the serum? \[ \text{[Li⁺]} = \] ______ mM **Note**: The problem requires calculating the original concentration of lithium ions in the serum using the data from the flame emission spectroscopy readings before and after spiking with a lithium standard.
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