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A student has a sample (less than 100 mg) that she would like to test for presence of lead. She has access two different atomic absorption spectrometers (flame and furnace) that could be used for analysis. Please identify what type of AAS method that she would use, and then discuss why this is the case, in a very concise manner.
What mass of NaCl must be dissolved in 65.0 grams of water to lower the freezing point by 7.50 °C? The freezing point depression constant, Kfp, for water is -1.86 °C/m. Assume the van't Hoff factor for NaCl is 1.87.
What do you notice about the element Technetium (Tc) compared to the other elements around it? You see the same thing as some of the very heavy elements
Calculated what is the pressure in atm using the van der Waals' equation for Oxygen gas under these conditions? For O 2 , it is given a = 1.360 L2atm/mol2 and b = 3.183E-2 L/mol.
The concentration of Mg2+ in seawater is 0.052 M. What is the pH when 95% of the magnesium ions will be precipitated as the hydroxide salt. (Ksp, Mg(OH)2 is 8.9 x 10-12).
How does lowering the temperature of the chambers in the simulation change the speed at which the molecules move?
Using the values from appendix C in the text calculate the Entropy and Enthalpy changes for the decomposition of ammonia into nitrogen and hydrogen at 298K and 1.0atm. Then determine the temperature at which the gases are in equilibrium with each ..
Calculate the number of theoretical plates N in the column of length L in 17 cycles. The observed resolution is 1.51.Now, calculate the plate height in the column in ?m.Estimate the resolution in 2 cycles
The student found that 8.67mL of NaOH solution was needed to titrate a 0.0544g sample of the acid to the equivalence point. Calculate the mass of unknown required for a 30.0mL titration.
The dissociation equilibrium constants for the protonated form of alanine (a diprotic amino acid H2X+) are ka1=4.6 x 10^-3 and ka2= 2.0 x 10^-10 What is the pH of 50.00 mL of a 0.100 M solution of alanine after 100.00 mL of 0.100 M NaOH has been a..
CaCN2 + 3H2O -> CaCO3 + 2NH3 . How much NH3 is produced if 187 g of CaCO3 are produced?
Suppose you wished to control the PO43- concentration in a solution of phosphoric acid by controlling the pH of the solution. If you assume you know the H3PO4 concentration, what combined equation would be useful for that purpose? Include physical..
Silicon has a band gap of 1.1 eV at room temperature. What wavelength of light would a photon of this energy correspond to?
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