What is the role of iron nitrate in determining the concentration using a spectrophotometer?
What is the role of iron nitrate in determining the concentration using a spectrophotometer?
Part C The absorbance of a cationic iron(II) sample solution was measured in a spectrophotometer, but the instrument returned an error because the absorbance was too high. The sample was then diluted by using a pipette to take 100.0 μL of the sample and injecting it into a cuvette already containing 2.00 mL of water (total volume is 2.00 mL + 100.0 μL). The absorbance value of the diluted solution corresponded to a concentration of 6.70×10−6 M . What was...
In an Iron/Lead electrochemical cell with a potassium-nitrate salt bridge, the concentration of Iron sulfate used is 4.69 molar and the concentration of lead sulfate used is 0.027 molar. Calculate the Gibbs free energy of the cell at 22.8 oC. Use the constants listed above in your calculations. Only enter the magnitude of your response and do not enter units. The units are expected to be joules.
Determining pH using a Concentration Cell
Part A - Determining pH Using a Concentration Cell A concentration cell constructed from two hydrogen electrodes, both with PH2 = 1.00. One electrode is immersed in pure H2O and the other in 6.0 M hydrochloric acid. What is the emf generated by the cell and what is the identity of the electrode that is immersed in hydrochloric acid?
To minimize the uncertainty in the measured concentration of an unknown using a visible spectrophotometer, the analyst should a. Use a wavelength exhibiting high absorptivity. b. Select a wavelength where only the analyte responds. c. Adjust the absorbance of the unknown so that it is close to the mean absorbances of the standards used to develop the calibration curve. d. All of the above.
1L solution with 0.1M nickel (II) nitrate and 0.1M iron (III) nitrate. We will add trisodium phosphate to the second metal till it precipitates. What is the concentration of the ions in the mixture? How much trisodium phosphate is added?
In order to analyze water samples using a spectrophotometer or plate reader, it is necessary to turn the molecules of nitrate into a dye molecule that can be quantified. The first step in turning nitrate (NO3-) into a dye molecule is reducing it to a molecule of nitrite (NO2-). This is done by reacting the NO3- with cadmium. After the reduction reaction, the NO2- is reacted with two additional reagents. The first reagent, Reagent A, is a solution of sulfanilamide and...
Part C The absorbance of a cationic iron(II) sample solution was measured in a spectrophotometer, but the instrument returned an error because the absorbance was too high. The sample was then diluted by using a pipette to take 100.0 μL of the sample and injecting it into a cuvette already containing 2.00 mL of water (total volume is 2.00 mL + 100.0 μL). The absorbance value of the diluted solution corresponded to a concentration of 6.70×10−6 M . What was...
Calculate the osmotic pressure of a 0.0995 M iron (III) nitrate solution at 25°C, in units of atm. What concentration of glucose would be needed to make a solution that is isotonic with the iron (III) nitrate solution?
A) If your spectrophotometer can measure a maximum absorbance of 1.5, what is the maximum concentration of Compound N (ε=6220 M-1cm-1) that you can measure without diluting? B) If you add 3mL of water to 1mL of Compound, mix and get an absorbance of 0.2, what is the concentration of the original solution?
The following data was collected using a spectrophotometer Concentration (M) Absorbance 0.2 0.27 0.3 0.41 0.4 0.55 0.5 0.69 When the data is plotted, an equation of y 1.3741x can be fitted as shown in the graph below: ea y13742 03 03 0s 02 e3 04 Concentralion, M What is the concentration of a 1 cm path length sample whose absorbance is 0.6? Assume absorbance was recorded under the same conditions as all the data above.