Based on your values of ?C for both of the iron-thiocyanate complexes, determine which of the...
Based on your values of ?C for both of the iron-thiocyanate complexes, determine which of the following is the predominate equilibrium reaction. Explain your reasoning in your discussion.
Step 1: Fe3+(??) + SCN-(??) FeSCN2+(??)
Step 2: FeSCN2+(??) + SCN-(??) Fe(SCN)2+(??)
Kc values for FeSCN2+:
115.50, 148.55, 167.59, 155.97, 151.14
Kc values for Fe(SCN)2+:
434527, 230217, 175869, 118191, 90321
Homework Answers
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Based on your values of ?C for both of the
iron-thiocyanate complexes, determine which of the...
Iron thiocyanate (FeSCN2+) is a complex ion that appears orange-red in solution. Iron(III) (Fe3+) and thiocyanate...
Iron thiocyanate (FeSCN2+) is a complex ion that appears orange-red in solution. Iron(III) (Fe3+) and thiocyanate (SCN-) are both colorless in solution. FeSCN2+ (aq) --(equilibrium)-- Fe3+ (aq) + SCN- (aq) a) If you add Fe(NO3)3 to a solution of these ions at equilibrium, in which direction will the reaction run to reach a new equilibrium? b) Silver ions react with thiocyanate ions to form a white precipitate. If you add silver ions to a solution of these ions at equilibrium,...
In this experiment, we will be studying the reaction of the iron(III) ion with the thiocyanate...
In this experiment, we will be studying the reaction of the iron(III) ion with the thiocyanate ion to form the red-colored complex ion pentaaquathiocyanatoiron(III), [Fe(H20)s(SCN)]?". As we will learn later, the Fetion in water is actually better represented as a complex ion with 6 water molecules attached to the central iron, [Fe(H20)] (aq). The SCN ion replaces one of the water molecules attached to the Fe" in the following reaction. [Fe(H2O).] (aq) + SCN (aq) [Fe(H2O)(SCN)]2(aq) + H2O(1) AH° (-)...
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...
The following data were taken to determine the equilibrium constant of the Iron(III)-Thiocyanate Complex Ion:...
The following data were taken to determine the equilibrium constant of the Iron(III)-Thiocyanate Complex Ion: Tube .00200 M KSCN (ml) .00200 M Fe(NO3)3 (ml) Absorbance 2 8 2 .480 4 5 5 .720 6 2 8 .448 The product of eb = 6120 L/mol. Determine the [Fe(SCN] in tube 2 Determine what the concentration of the Iron(III) in tube 2 would be if none of it reacted. Determine what the concentration of the thiocyanate ion in tube 2 would...
2. If the reaction between iron(III) ion and thiocyanate ion yielded an equilibrium concentration of 0.30...
2. If the reaction between iron(III) ion and thiocyanate ion yielded an equilibrium concentration of 0.30 M for each of these ions, what is the equilibrium concentration of the red iron(III)-thiocyanate complex? (Hint: The equilibrium constant for the reaction is in the Background section.) Show your work 3. In the reaction below, NH3(g) + H2O(1) - NH; +H30+ the equilibrium constant is 10-34. Is this reaction likely to take place? Explain your answer. iron(III) and thiocyanate ions, the equilibrium expression...
As you will do in lab, a student prepared the following 2 mixtures and recorded their absorbances...
As you will do in lab, a student prepared the following 2 mixtures and recorded their absorbances in a cuvette with a 1.00 cm path length Table 1.Absorbance of iron (Il) thiocyanate Volume, ml Fe3- 10.0 0.020 M2.64 x 10M Absorbance SCN 10.0 10.0 Mix #1 0.20 M Fel 10.01 0.769 0.495 1. Write the balanced equilibrium reaction of Fe(aq) with SCN (aq) to form [FeSCNJ (aq). 2. Write the equilibrium formation constant expression for the reaction (Kyexpression) Determination of...
why? C. Iron(III)-Thiocyanate Equilibrium Fe (aq)+ SCN (aq)FesCN (aq) Record your observations and write explanations for...
why?
C. Iron(III)-Thiocyanate Equilibrium Fe (aq)+ SCN (aq)FesCN (aq) Record your observations and write explanations for SCN solution to the P e(NO,) solution. turmed deer e 2. the results of your procedure, is the equilibrium exothermic or endothermic? Esplainemie 176
Fe (aq)SCN-(aq) FeSCN (aq) thiocyanate iron(II) thiocyanoiron(il) Introduction When the reactants shown above, are combined, chemical...
Fe (aq)SCN-(aq) FeSCN (aq) thiocyanate iron(II) thiocyanoiron(il) Introduction When the reactants shown above, are combined, chemical equilibrium is reached rapidly. Once equilibrium is established, the equilibrium constant can be calculated if the concentration of all the ions are known: [FeSCNP.he [SCN-... and (Feng Your task is to prepare three different equilibrium systems that contain different concentrations of these ions. Keep in mind that although the concentrations will be different, the value of the equilibrium constant Ke will be indeed constant...
Consider the following: A student mixes 5.00 mL 2.00 × 10−3 M Fe(NO3)3 with 3.00 mL...
Consider the following: A student mixes 5.00 mL 2.00 × 10−3 M Fe(NO3)3 with 3.00 mL 2.00 × 10−3 M KSCN. She finds that in the equilibrium mixture the concentration of FeSCN2+ is 1.28 × 10−4 M. Find Kc for the reaction Fe3+(aq) + SCN−(aq) ↔ FeSCN2+(aq). a. What is the initial concentration of Fe3+ in the reaction mixture? [Fe3+] = ___ x 10-3 M b. What is the initial concentration of SCN- in the reaction mixture? [SCN-] = ___...
1) Consider the following equilibrium: Fe3+(aq) + SCN-(aq) ⇌ FeSCN2+(aq) Initial concentrations: [Fe3+] = 0.590; [SCN-]...
1) Consider the following equilibrium: Fe3+(aq) + SCN-(aq) ⇌ FeSCN2+(aq) Initial concentrations: [Fe3+] = 0.590; [SCN-] = 1.239; [FeSCN2+] = 0 The equilibrium concentration of [FeSCN2+]eq = 0.454 M. What is the numerical value of KC for this equilibrium? KC = __________________ 2) Consider the following equilibrium: Fe3+(aq) + SCN-(aq) ⇌ FeSCN2+(aq) Initial concentrations: [Fe3+] = 0.370; [SCN-] = 0.777; [FeSCN2+] = 0 The equilibrium concentration of [FeSCN2+]eq = 0.285 M. What is the equilibrium concentration of Fe3+? [Fe3+]eq =...
In this experiment, we will be studying the reaction of the iron(III) ion with the thiocyanate ion to form the red-colored complex ion pentaaquathiocyanatoiron(III), [Fe(H20)s(SCN)]?". As we will learn later, the Fetion in water is actually better represented as a complex ion with 6 water molecules attached to the central iron, [Fe(H20)] (aq). The SCN ion replaces one of the water molecules attached to the Fe" in the following reaction. [Fe(H2O).] (aq) + SCN (aq) [Fe(H2O)(SCN)]2(aq) + H2O(1) AH° (-)...
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...
2. If the reaction between iron(III) ion and thiocyanate ion yielded an equilibrium concentration of 0.30 M for each of these ions, what is the equilibrium concentration of the red iron(III)-thiocyanate complex? (Hint: The equilibrium constant for the reaction is in the Background section.) Show your work 3. In the reaction below, NH3(g) + H2O(1) - NH; +H30+ the equilibrium constant is 10-34. Is this reaction likely to take place? Explain your answer. iron(III) and thiocyanate ions, the equilibrium expression...
As you will do in lab, a student prepared the following 2 mixtures and recorded their absorbances in a cuvette with a 1.00 cm path length Table 1.Absorbance of iron (Il) thiocyanate Volume, ml Fe3- 10.0 0.020 M2.64 x 10M Absorbance SCN 10.0 10.0 Mix #1 0.20 M Fel 10.01 0.769 0.495 1. Write the balanced equilibrium reaction of Fe(aq) with SCN (aq) to form [FeSCNJ (aq). 2. Write the equilibrium formation constant expression for the reaction (Kyexpression) Determination of...
why?
C. Iron(III)-Thiocyanate Equilibrium Fe (aq)+ SCN (aq)FesCN (aq) Record your observations and write explanations for SCN solution to the P e(NO,) solution. turmed deer e 2. the results of your procedure, is the equilibrium exothermic or endothermic? Esplainemie 176
Fe (aq)SCN-(aq) FeSCN (aq) thiocyanate iron(II) thiocyanoiron(il) Introduction When the reactants shown above, are combined, chemical equilibrium is reached rapidly. Once equilibrium is established, the equilibrium constant can be calculated if the concentration of all the ions are known: [FeSCNP.he [SCN-... and (Feng Your task is to prepare three different equilibrium systems that contain different concentrations of these ions. Keep in mind that although the concentrations will be different, the value of the equilibrium constant Ke will be indeed constant...
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