Atomic emission spectroscopy and the method of standard addition are used to determine the Na+ concentration and its uncertainty in an unknown sample. Increasing amounts of a 1.75 μg/mL standard Na+ solution are added to a series of volumetric flasks containing 15.00 mL of the unknown solution. The volumetric flasks are then diluted to a final volume of 200.0 mL. Atomic emission spectroscopy is then used to measure the emission intensity of each solution. Unknown volume Standard volume (mL) (mL) Final volume (mL) Emission intensity 15.00 0.00 200.0 351.0 15.00 5.00 200.0 494.0 15.00 10.00 200.0 642.0 15.00 15.00 200.0 807.0 15.00 20.00 200.0 948.0 Based on the data in the table, determine the original concentration of Na+ and its uncertainty in the unknown sample. Report the uncertainty with three significant figures. concentration: μg/mL 土 μg/mL

Note: The Emission Intensity of the original solution is not given since the calibration method is standard addition.

Based on the data in the table, determine the original concentration of Na+ and its uncertainty in the unknown sample. Report the uncertainty with three significant figures.

You have been asked to determine which heavy metals, if any are in a sample of sewage sludge. Why is atomic absorption spectroscopy not a good technique for the job and why is ICP- atomic emission spectroscopy a better choice?

Describe the basic design difference between a spectrometer for absorption measurements and one for emission studies?

26. What exactly is flame atomic absorbtion spectrometer?

A 50.0 mg sample was dissolved in acid and then diluted to a total volume of 50.00 mL. If 1.000 mL ofthis solution was then diluted to 50.00 mL with water. If this diluted solution had a transmittance of 0.275 at520 nm, what is the concentration of KMnO4 in ppm in this diluted solution, assuming no interference fromother species at this wavelength?

A student mixed 5.00mL of 0.0020M Fe(NO3)3, 3.00mL of 0.0020M KSCN, and 3.00mL of distilled water. The mixture reacted to form a reddish solution indicating that FeSCN2+ was formed, according to the equation below. An absorbance of 0.21 was measured for this solution in a Spectrophotometer set at a wavelength of 447nm. Fe³+ (aq) + SCN (aq) FeSCN2+ (aq) A calibration curve was used to find the equilibrium concentration of the product of this reaction: y = 1895x + 0.027 Calculate the equilibrium concentration of the Fe³+ Report your answer to 4 sig figs

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 276 units for the intensity of the 671 nm red emission line. Then, 1.00 mL of a 10.8 mM lithium standard was added to 9.00 mL of serum. This spiked serum gave an intensity reading of 621 units at the 671 nm emission line. What is the original concentration of Li+ in the serum?

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? [Li*] = mM Create Your Account stv hulu G Search or type URL 24 & 4 5 6 7 R Y G K * CO