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atomic absorption spectrometer was used with the method of standard additions to determine the concentration of cadmium in a sample of an industrial waste stream. For the addition, 10 uL of a 1000 ug/mL Cd standard was added to 10 mL of solution. The following data were obtained:Absorbance of reagent black= .034absorbance of sample= .346absorbance of sample plus addition= .703
1.What was the concentration of the cadmium in the waste stream sample?
2. Later, the analyst learned that the blank was not truly a reagent blank, but water. The absorbance of the actual reagent blank, was 0.082. Calculate the cadmium concentration using the new info of the blank.
3. Calculate the percent error caused by using water instead of the reagent blank.
calculate the molar mass of the solute (acetic acid) and suggest what the structure might be.
determine the moles of product ( Fe for this reaction) made by both reagents. what is the limiting reagent?
How many cubic centimeters of an ore containing only 0.22% gold (by mass) must be processed to obtain $100 worth of gold.
A gas sample containing 1.47 mol at 25°C exerts a pressure of 401 torr. Some gas is added to the same container, and the temperature is increased to 50.°C. If the pressure increases to 800. torr,
Using the Bohr equation for the energy of any level in a hydrogen atom, calculate the energy of each level, n=1 through n=8 and n=(infinity), f. Calculate change in Energy
consider the reversible reaction of carbon monoxide and water vapor yeilding carbon dioxide and hydrogen.
They are all buffer solutions and would all have the same capacity 2) Of the following solutions, which has the greatest buffering capacity?
Calculate the number of grams of HC2H3O2 needed to make 450 mL of 0.322 M solution.
Since cereal sample may have other materials other than Fe that absorbs light. Using cereal sample as the blank can eliminate these absorption so that the transmittance was solely due to Fe.
The standard change in Gibbs free energy is deltaG= -32.8kJ/mol. What is deltaG for this reaction at 298K when the partial pressures are PNO= .200atm, PO2= .100atm, and PNO3= .850atm
Sodium atoms(Na) emit light with a wavelength(λ) of 330 nano meters when an electron moves from a state of 4 p orbital to a state of 3 s orbital now you just need to determine the energy difference between the orbitals.
A reaction takes place with a mass defect (lost mass) of 0.030kg. How much energy does the correspond to?
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