Calculate [Fe3+] and [SCN-] for each of the nine trials. Show the calculations for Sample 1
calibration curve is y=3967.7x-0.0822
the R^2 value is y=0.09959
Homework Answers
We can determine the concentration of Fe(SCN)2+ from the absorbance values and the calibration curve (remember that the x variable represents concentration and the y variable represents absorbance). For Trial 1:
The initial concentration of SCN- si given by the dilution formula:
And the concentration in equilbrium is the difference between this value and the concentration consumed to produce Fe(SCN)2+, which we just calculated:
2.00x10-4 M - 5.50x10-5 M = 1.45x10x10-4 M
The same for Fe3*, its initial concentration is.
And its equilibrium concentration is:
1.8x10-3 M - 5.50x10-5 M = 1.75x10-3 M.
For all of the samples, the results are (commas are decimal separators):
| Sample | V Fe(III) | V SCN- | Absorbance | [FeSCN(II)] eq | [Fe(III)] eq | [SCN-] eq |
| 1 | 9 | 1 | 0,136 | 5,50E-05 | 1,75E-03 | 1,45E-04 |
| 2 | 8 | 2 | 0,23 | 7,87E-05 | 1,52E-03 | 3,21E-04 |
| 3 | 7 | 3 | 0,307 | 9,81E-05 | 1,30E-03 | 5,02E-04 |
| 4 | 6 | 4 | 0,378 | 1,16E-04 | 1,08E-03 | 6,84E-04 |
| 5 | 5 | 5 | 0,428 | 1,29E-04 | 8,71E-04 | 8,71E-04 |
| 6 | 4 | 6 | 0,416 | 1,26E-04 | 6,74E-04 | 1,07E-03 |
| 7 | 3 | 7 | 0,406 | 1,23E-04 | 4,77E-04 | 1,28E-03 |
| 8 | 2 | 8 | 0,349 | 1,09E-04 | 2,91E-04 | 1,49E-03 |
| 9 | 1 | 9 | 0,272 | 8,93E-05 | 1,11E-04 | 1,71E-03 |
Add Answer to:
Calculate [Fe3+] and [SCN-] for each of the nine trials. Show
the calculations for Sample 1...
Plot of absorbance vs concentration for calibration curve. Data sheet stapled to back of DRA. Solution...
Plot of absorbance vs concentration for calibration curve. Data sheet stapled to back of DRA. Solution Stock solution Dilution 1 (50.0%) Dilution 2 (25.0%) Dilution 3 (12.5%) (SCN) (FeSCNI. 2.0 x10M 2.0 X10M 1.0 x 10-4 M 1.0104M 5.0 x10-5M 5.0*10-5M 2.5 x 10-5Ma.5 x10 -5M 0.836 0.389 0.180 0.085 Calibration curve trendline equation_=43 15.1 % - 0.032 Rvalue of trendline 0.9993 Absorbance Sample Number 0.0020 M Fe(NO), (ml) 0.0020 M KSCN (ML) - - - - - 0. 129...
Data Sheet & Calculations. Part I: For this part of the experiment assume (SCN-1 = (FeSCN21...
Data Sheet & Calculations. Part I: For this part of the experiment assume (SCN-1 = (FeSCN21 Table 3: Trial % Transmittance [SCN*); [Fe(SCN)2+) 0.00004 2 89.9 Absorbance 3 79.1 0.00008 4 66.1 0.00012 5 58.3 0.00016 6 51.0 0.00020 Calculate the [SCN] and [Fe'")accounting for dilution using MeV. = MVd, for each solution in Table 1. Show one sample calculation for absorbance, [SCN-] and [FeSCN2-). Enter all calculated values into Table 3 above. Absorbance: Use Eqn. # 2 (2.000 -...
Partner: Data Sheet & Calculations. Part I: For this part of the experiment assume (SCN"]= FeSCN21...
Partner: Data Sheet & Calculations. Part I: For this part of the experiment assume (SCN"]= FeSCN21 Table 3: Trial % Transmittance [SCN); [Fe(SCN)?) Absorbance 2 89.9 0.00004 0.0462 0.00004 3 79.1 0.00008 0-1018 0.00012 4 66.1 10.17918 000012 5 58.3 0.00016 10.2343 o.ooola 0.00020 6 51.0 0.2924 0.00 02 apb00% Calculate the [SCN Ji and [Fe3+]; accounting for dilution using MeV. - MV., for each solution in Table 1. Show one sample calculation for absorbance, (SCN) and [FeSCN?"). Enter all...
For each equilibrium sample, calculate the initial concentrations (assuming no reaction occurred)...
For each equilibrium sample, calculate the initial
concentrations (assuming no reaction occurred) of SCN–
and Fe3+ based on the dilution factors used.
Enter the absorbance values for each sample.
For the standard solution, assume that, when equilibrium is
reached, the [FeSCN2+]eq is equal to
[SCN–]ini. Why is this a good
assumption?
For the equilibrium solutions, calculate the
[FeSCN2+]eq (Ceq) using Eq.
4.
Using Eq. 5 and 6, calculate
[Fe3+(aq)]eq and
[SCN–(aq)]eq for each equilibrium
solution.
Calculate values for the equilibrium...
can you please help me with this Data and Calculations Trial 0:29 Absorbance 0.378 Je 0.086...
can you please help me with this
Data and Calculations Trial 0:29 Absorbance 0.378 Je 0.086 Trial 2 0.47 Trial 3 0.632 Trial 4 0.729 0.686 Absorbance of standard Triw. 329 0.6 6 Temperature ke [Fe(SCN) 2+]/([Fe3+] [SCN-]) Ferrag) + SCN Cag) 2 FescN2t (ag) Absorbance of standard (Trial) Temperature 0.3 Ke expression: [Fe] 0.0010 [SCN) 10.00040 [FeSCN? Jeg [Fe [SCN ] Ke value Average of Ke values Percent error (see pg 7): (Discuss this result as part of your...
help with calculating the “initial [SCN^—]” M and the Equilibrium [Fe(SCN^2+)] M. i have one. just...
help with calculating the “initial [SCN^—]” M and the Equilibrium
[Fe(SCN^2+)] M.
i
have one. just not sure how to set up the equation to find the
inital [SCN^-] . not sure if im calculating it correctly.
Data Manipulation and Calculations Calibration Solutions Data 1. Calculate the "Initial [SCN']" molarities for the solutions using the dilution equation CiVI=C2V2 2. Use the net ionic equation for the reaction, the ratio of [Fe3 [SCN'] used, and your knowledge of Le Châtelier's Principle...
Lab Report: Determination of Kc for a Complex Ion Formation tube 2.00e-3 Fe3+ (mL) 2.00E-3M SCN-...
Lab Report: Determination of Kc for a Complex Ion Formation
tube
2.00e-3 Fe3+ (mL)
2.00E-3M SCN- (mL)
water (mL)
initial conc. Fe3+
initial conc. SCN-
1
5.00
5.00
0
1.00e-3M
1.00E-3M
2
5.00
4.00
1.00
1.00E-3M
8.00E-3M
3
5.00
3.00
2.00
1.00E-3,
6.00E-3M
4
5.00
2.00
3.00
1.00E-3M
4.00E-3M
5
5.00
1.00
4.00
1.00E-3M
2.00E-3M
10ml of 0.200M Fe3+, 2.00ml of 0.00200M SCN-, AND 8.00ml of
water results in an eq. [FeSCN2+] IN Standard
Soln.:2.00E-4M
Could you please explain how...
help with finding the equilibrium of [Fe(SCN)^2+] morality value Equilibrium Solutions Data 1. Use your "Absorbance...
help with finding the equilibrium of [Fe(SCN)^2+] morality value
Equilibrium Solutions Data 1. Use your "Absorbance of Solution" values and the graph you made above to interpolate the "Equilibrium [Fe(SCN)]" molarity values. 2. Calculate both the "Initial [Fe ]" and the "Initial [SCN']" molarity values using then dilution equation CiVi C2V2. 3. Calculate the "Equilibrium [Fe ]" molarity values by subtracting the "Equilibrium [Fe(SCN) " molarity values from the "Initial [Fe'" molarity values. 4. Calculate the "Equilibrium [SCN']" molarity values...
Calculate the initial concentration of Fe3+ in test tubes 1-4. (you will need to take the...
Calculate the initial concentration of Fe3+ in test tubes 1-4. (you will need to take the dilution in to account) Calculate the initial concentration of SCN-in each of test tubes 1-4. (you will need to take the dilution in to account) 2. Label four 20 x 150 mm test tubes 1-4. Pour about 30 mL of 0.0020 M Fe(NO3)3 into a clean, dry 100-ml beaker. Pipet 5.0 mL of this solution into each of the four labeled test tubes. Use...
4 please in part 1 gires us absorbance values for each sample , changes in concentration...
4 please
in part 1 gires us absorbance values for each sample , changes in concentration and absorbance will cause a curve 1. For each new concentration of FeSCN2+ a new absorbance will be plotted. 4. After completing Part A of this experiment, a student determines the slope of their calibration graph of absorbance versus (FeSCN to be 5140 M". In Part B, a student combines 2.00 mL of a 0.00200 M solution of KSCN with 5.00 mL of a...
Plot of absorbance vs concentration for calibration curve. Data sheet stapled to back of DRA. Solution Stock solution Dilution 1 (50.0%) Dilution 2 (25.0%) Dilution 3 (12.5%) (SCN) (FeSCNI. 2.0 x10M 2.0 X10M 1.0 x 10-4 M 1.0104M 5.0 x10-5M 5.0*10-5M 2.5 x 10-5Ma.5 x10 -5M 0.836 0.389 0.180 0.085 Calibration curve trendline equation_=43 15.1 % - 0.032 Rvalue of trendline 0.9993 Absorbance Sample Number 0.0020 M Fe(NO), (ml) 0.0020 M KSCN (ML) - - - - - 0. 129...
Data Sheet & Calculations. Part I: For this part of the experiment assume (SCN-1 = (FeSCN21 Table 3: Trial % Transmittance [SCN*); [Fe(SCN)2+) 0.00004 2 89.9 Absorbance 3 79.1 0.00008 4 66.1 0.00012 5 58.3 0.00016 6 51.0 0.00020 Calculate the [SCN] and [Fe'")accounting for dilution using MeV. = MVd, for each solution in Table 1. Show one sample calculation for absorbance, [SCN-] and [FeSCN2-). Enter all calculated values into Table 3 above. Absorbance: Use Eqn. # 2 (2.000 -...
Partner: Data Sheet & Calculations. Part I: For this part of the experiment assume (SCN"]= FeSCN21 Table 3: Trial % Transmittance [SCN); [Fe(SCN)?) Absorbance 2 89.9 0.00004 0.0462 0.00004 3 79.1 0.00008 0-1018 0.00012 4 66.1 10.17918 000012 5 58.3 0.00016 10.2343 o.ooola 0.00020 6 51.0 0.2924 0.00 02 apb00% Calculate the [SCN Ji and [Fe3+]; accounting for dilution using MeV. - MV., for each solution in Table 1. Show one sample calculation for absorbance, (SCN) and [FeSCN?"). Enter all...
For each equilibrium sample, calculate the initial
concentrations (assuming no reaction occurred) of SCN–
and Fe3+ based on the dilution factors used.
Enter the absorbance values for each sample.
For the standard solution, assume that, when equilibrium is
reached, the [FeSCN2+]eq is equal to
[SCN–]ini. Why is this a good
assumption?
For the equilibrium solutions, calculate the
[FeSCN2+]eq (Ceq) using Eq.
4.
Using Eq. 5 and 6, calculate
[Fe3+(aq)]eq and
[SCN–(aq)]eq for each equilibrium
solution.
Calculate values for the equilibrium...
can you please help me with this
Data and Calculations Trial 0:29 Absorbance 0.378 Je 0.086 Trial 2 0.47 Trial 3 0.632 Trial 4 0.729 0.686 Absorbance of standard Triw. 329 0.6 6 Temperature ke [Fe(SCN) 2+]/([Fe3+] [SCN-]) Ferrag) + SCN Cag) 2 FescN2t (ag) Absorbance of standard (Trial) Temperature 0.3 Ke expression: [Fe] 0.0010 [SCN) 10.00040 [FeSCN? Jeg [Fe [SCN ] Ke value Average of Ke values Percent error (see pg 7): (Discuss this result as part of your...
help with calculating the “initial [SCN^—]” M and the Equilibrium
[Fe(SCN^2+)] M.
i
have one. just not sure how to set up the equation to find the
inital [SCN^-] . not sure if im calculating it correctly.
Data Manipulation and Calculations Calibration Solutions Data 1. Calculate the "Initial [SCN']" molarities for the solutions using the dilution equation CiVI=C2V2 2. Use the net ionic equation for the reaction, the ratio of [Fe3 [SCN'] used, and your knowledge of Le Châtelier's Principle...
Lab Report: Determination of Kc for a Complex Ion Formation
tube
2.00e-3 Fe3+ (mL)
2.00E-3M SCN- (mL)
water (mL)
initial conc. Fe3+
initial conc. SCN-
1
5.00
5.00
0
1.00e-3M
1.00E-3M
2
5.00
4.00
1.00
1.00E-3M
8.00E-3M
3
5.00
3.00
2.00
1.00E-3,
6.00E-3M
4
5.00
2.00
3.00
1.00E-3M
4.00E-3M
5
5.00
1.00
4.00
1.00E-3M
2.00E-3M
10ml of 0.200M Fe3+, 2.00ml of 0.00200M SCN-, AND 8.00ml of
water results in an eq. [FeSCN2+] IN Standard
Soln.:2.00E-4M
Could you please explain how...
help with finding the equilibrium of [Fe(SCN)^2+] morality value
Equilibrium Solutions Data 1. Use your "Absorbance of Solution" values and the graph you made above to interpolate the "Equilibrium [Fe(SCN)]" molarity values. 2. Calculate both the "Initial [Fe ]" and the "Initial [SCN']" molarity values using then dilution equation CiVi C2V2. 3. Calculate the "Equilibrium [Fe ]" molarity values by subtracting the "Equilibrium [Fe(SCN) " molarity values from the "Initial [Fe'" molarity values. 4. Calculate the "Equilibrium [SCN']" molarity values...
Calculate the initial concentration of Fe3+ in test tubes 1-4. (you will need to take the dilution in to account) Calculate the initial concentration of SCN-in each of test tubes 1-4. (you will need to take the dilution in to account) 2. Label four 20 x 150 mm test tubes 1-4. Pour about 30 mL of 0.0020 M Fe(NO3)3 into a clean, dry 100-ml beaker. Pipet 5.0 mL of this solution into each of the four labeled test tubes. Use...
4 please
in part 1 gires us absorbance values for each sample , changes in concentration and absorbance will cause a curve 1. For each new concentration of FeSCN2+ a new absorbance will be plotted. 4. After completing Part A of this experiment, a student determines the slope of their calibration graph of absorbance versus (FeSCN to be 5140 M". In Part B, a student combines 2.00 mL of a 0.00200 M solution of KSCN with 5.00 mL of a...
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