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3. Calculate the molar absorptivity of a 0.200 M compound A if the light path length...
Please help me answer the following questions: (iv) Calculate the molar extinction coefficient (molar absorptivity) of t...
Please help me answer the following
questions:
(iv) Calculate the molar extinction
coefficient (molar absorptivity) of the maximum absorbance of the
spectrum in Figure 1.
(v) Estimate the wavenumber gap
between the vibrational levels that gives the vibronic structure
apparent in the spectrum of anthracene. Check your answer before
proceeding to answer the next question. (Note: the peaks
are a single vibronic progression so you can average your estimates
of the wavenumber gap.)
5 M compound (2) Figure 1: Absorbance...
2) An organic diprotic acid has an absorption spectrum that depends on pH. The spectra shown belo...
2) An organic diprotic acid has an absorption spectrum that depends on pH. The spectra shown below show the absorbance of three solutions with different pH values. Each solution had a concentration of 0.0100M. The cell pathlength is 1.00 cm. The dissociation constants of the acid are Ki 103 and K2-1011 a) What are the equilibrium concentrations of the H2A, HA, and A2 forms at each pH? b) What is the molar absorptivity of each form at 630 nm? c)...
2) An organic diprotic acid has an absorption spectrum that depends on pH. The spectra shown...
2) An organic diprotic acid has an absorption spectrum that depends on pH. The spectra shown below show the absorbance of three solutions with different pH values. Each solution had a concentration of 0.0100M. The cell pathlength is 1.00 cm. The dissociation constants of the acid are Ki 103 and K2-1011 a) What are the equilibrium concentrations of the H2A, HA, and A2 forms at each pH? b) What is the molar absorptivity of each form at 630 nm? c)...
the guiding questions. the max absorbance is 460. Guiding questions complex turque . Compare the molar...
the
guiding questions. the max absorbance is 460.
Guiding questions complex turque . Compare the molar absorptivity coefficients you obtained with SCN and Fe" as limiting reagents. Would you expect them to be the same? Why or why not? (Week 1) • The accepted molar absorptivity coefficient for FeSCN is 7.0x10' M'cm''. Find the bias and relative bias of your values and suggest possible sources of errors. (Week 1) • Which molar absorptivity coefficient will you use to calculate the...
Show a sample of the ICE table that will be used to calculate Kc. For your...
Show a sample of the ICE table that will be used to calculate Kc. For your example, use the trial one with 2.00 mL of SCN and 5.00 mL of Fets and an arbitrary absorbance value for FeSCN+2 between 0.200 -0.400. (Note: Both reactant stock solutions are 0.00200 M) Hints to consider as you are preparing the ICE table: What is the reaction being investigated? • What is the final volume of the reaction mixture? What are the initial concentrations...
Hybrobromous acid, HBrO, is a weak acid. It's acid dissociation constant. Ka is 2.5 x 10-9 a) Calculate the [H+] of a 0....
Hybrobromous acid, HBrO, is a weak acid. It's acid dissociation constant. Ka is 2.5 x 10-9 a) Calculate the [H+] of a 0.14 molar solution of HBrO b) Write the correctly balanced net ionic equation for the reaction that occurs NaBrO is dissolved in water and calculate the numerical value of the equilibrium constant for this reaction c) Calculate the pH of a solution made by combining 40.0 milliliters of 0.14 molar HBrO and 5.0 milliliters of 0.56 molar NaOH...
PROBLEM: Predict the molar absorptivity value of copper sulfate pentahydrate at 380 nm. Here's what I...
PROBLEM: Predict the molar absorptivity value of copper
sulfate pentahydrate at 380 nm.
Here's what I think I have to do:
I think I need to use beer's law. Abs=ebc; e=Abs/bc.
b is 1.66 cm. I think c is .400 M NiSO4, but I'm not sure. I
also think Abs is 0.758 given the graph. (If wavelength is 380 nm,
then it should be between 0.598 and 0.798, right?) My answer is
1.14 L/mol*cm, but not sure if I am...
Table A. Preparation of Standard solutions of FeSCN2+ 1.0 M HNO3 0.002 M 0.200 M Solution...
Table A. Preparation of Standard solutions of FeSCN2+ 1.0 M HNO3 0.002 M 0.200 M Solution KSCN (mL) Fe(NO3)3 (mL) 0.5 5 [FeSCN2+] (mol/L)* 1 4.0x10^-5 Add 1.0 M 2 1.0 5 8.0x10^-5 HNO3 3 1.5 5 1.2x10^-10 4 2.0 5 1.6x10-4 to each to adjust the volume to 25 mL. 5 2.5 5 2.0x10-4 * Calculate the concentrations of FeSCN2+ in each beaker, assuming that all SCN-ions exist as FeSCN2+. In other words, [FeSCN2+] (in Soln 1) = [SCN-]...
2. Given ky of 3.4 x 10-2 [mol L atm'), calculate the dissolved aqueous concentration of...
2. Given ky of 3.4 x 10-2 [mol L atm'), calculate the dissolved aqueous concentration of CO2 that would be at equilibrium with current CO2 concentrations in the atmosphere. (2 pts) The other reactions above are similarly associated with equilibrium constants: K, - [H.CO] CO2/01)] , [H][HCO3] K - TH.CO;] H][co;] THCO3] where K, = 1.7x10-3, K, = 2.5x10+ , and K. = 4.7 x 10-11 3. Knowing the reaction constants above, calculate the pH of water that is in...
SHORT ANSWER: 11. Hypobromous acid, HBO pobromous acid. HR is a weak acid. Its acid dissociation...
SHORT ANSWER: 11. Hypobromous acid, HBO pobromous acid. HR is a weak acid. Its acid dissociation constant. K is 2.5 x 10 (20 points) a) Calculate the [H") of a 0.14-molar solution of HBrO. b) Write the correctly balanced net ionic equation for the reaction that occurs NaBro is dissolved in water and calculate the numerical value of the equilibrium constant for this reaction. c) Calculate the pH of a solution made by combining 40.0 milliliters of 0.14-molar HBrO and...
Please help me answer the following
questions:
(iv) Calculate the molar extinction
coefficient (molar absorptivity) of the maximum absorbance of the
spectrum in Figure 1.
(v) Estimate the wavenumber gap
between the vibrational levels that gives the vibronic structure
apparent in the spectrum of anthracene. Check your answer before
proceeding to answer the next question. (Note: the peaks
are a single vibronic progression so you can average your estimates
of the wavenumber gap.)
5 M compound (2) Figure 1: Absorbance...
2) An organic diprotic acid has an absorption spectrum that depends on pH. The spectra shown below show the absorbance of three solutions with different pH values. Each solution had a concentration of 0.0100M. The cell pathlength is 1.00 cm. The dissociation constants of the acid are Ki 103 and K2-1011 a) What are the equilibrium concentrations of the H2A, HA, and A2 forms at each pH? b) What is the molar absorptivity of each form at 630 nm? c)...
2) An organic diprotic acid has an absorption spectrum that depends on pH. The spectra shown below show the absorbance of three solutions with different pH values. Each solution had a concentration of 0.0100M. The cell pathlength is 1.00 cm. The dissociation constants of the acid are Ki 103 and K2-1011 a) What are the equilibrium concentrations of the H2A, HA, and A2 forms at each pH? b) What is the molar absorptivity of each form at 630 nm? c)...
the
guiding questions. the max absorbance is 460.
Guiding questions complex turque . Compare the molar absorptivity coefficients you obtained with SCN and Fe" as limiting reagents. Would you expect them to be the same? Why or why not? (Week 1) • The accepted molar absorptivity coefficient for FeSCN is 7.0x10' M'cm''. Find the bias and relative bias of your values and suggest possible sources of errors. (Week 1) • Which molar absorptivity coefficient will you use to calculate the...
Show a sample of the ICE table that will be used to calculate Kc. For your example, use the trial one with 2.00 mL of SCN and 5.00 mL of Fets and an arbitrary absorbance value for FeSCN+2 between 0.200 -0.400. (Note: Both reactant stock solutions are 0.00200 M) Hints to consider as you are preparing the ICE table: What is the reaction being investigated? • What is the final volume of the reaction mixture? What are the initial concentrations...
PROBLEM: Predict the molar absorptivity value of copper
sulfate pentahydrate at 380 nm.
Here's what I think I have to do:
I think I need to use beer's law. Abs=ebc; e=Abs/bc.
b is 1.66 cm. I think c is .400 M NiSO4, but I'm not sure. I
also think Abs is 0.758 given the graph. (If wavelength is 380 nm,
then it should be between 0.598 and 0.798, right?) My answer is
1.14 L/mol*cm, but not sure if I am...
Table A. Preparation of Standard solutions of FeSCN2+ 1.0 M HNO3 0.002 M 0.200 M Solution KSCN (mL) Fe(NO3)3 (mL) 0.5 5 [FeSCN2+] (mol/L)* 1 4.0x10^-5 Add 1.0 M 2 1.0 5 8.0x10^-5 HNO3 3 1.5 5 1.2x10^-10 4 2.0 5 1.6x10-4 to each to adjust the volume to 25 mL. 5 2.5 5 2.0x10-4 * Calculate the concentrations of FeSCN2+ in each beaker, assuming that all SCN-ions exist as FeSCN2+. In other words, [FeSCN2+] (in Soln 1) = [SCN-]...
2. Given ky of 3.4 x 10-2 [mol L atm'), calculate the dissolved aqueous concentration of CO2 that would be at equilibrium with current CO2 concentrations in the atmosphere. (2 pts) The other reactions above are similarly associated with equilibrium constants: K, - [H.CO] CO2/01)] , [H][HCO3] K - TH.CO;] H][co;] THCO3] where K, = 1.7x10-3, K, = 2.5x10+ , and K. = 4.7 x 10-11 3. Knowing the reaction constants above, calculate the pH of water that is in...
SHORT ANSWER: 11. Hypobromous acid, HBO pobromous acid. HR is a weak acid. Its acid dissociation constant. K is 2.5 x 10 (20 points) a) Calculate the [H") of a 0.14-molar solution of HBrO. b) Write the correctly balanced net ionic equation for the reaction that occurs NaBro is dissolved in water and calculate the numerical value of the equilibrium constant for this reaction. c) Calculate the pH of a solution made by combining 40.0 milliliters of 0.14-molar HBrO and...
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