Determining the sodium concentration in coffee with flame atomic absorption spectroscopy (FAAS) can be challenging due to interferences. To overcome these interferences, lithium is commonly used as an internal standard. A researcher prepared a sample with an internal standard (Li+)to analyte (Na+)concentration ratio of 2.00/1.00. The ratio of the internal standard signal to the analyte signal (Li+signal/ Na+signal) was found to be 1.160/1.000. Determine the response factor, F F= A sample was then prepared containing 13.90mL of coffee and 5.80mL of 5.30ppmLi+, and diluted to a 50.00mL total volume. The ratio of the internal standard signal to the analyte signal in the unknown sample was found to be 0.880/1.000(Li+ signal/ /Na+signal). Determine the unknown concentration of Na+in the coffee sample. [Na+