Using your average Keq value (.3948), please calculate what the equilibrium concentrations of Fe3+ , SCN-...

Using your average K_eq value (.3948), please calculate what the equilibrium concentrations of Fe³⁺ , SCN^- , and FeSCN²⁺ in a solution made by combining 10.00mL of 0.0020M Fe(NO₃)₃ and 10.00mL of 0.0020M KSCN.

Solutions

Expert Solution

initial molarity of Fe+3 = 10 x 0.002 / 10 + 10 = 0.001 M

initial molarity of SCN- = 10 x 0.002 / 10 + 10 = 0.001 M

Fe+3 + SCN- ----------------------------------> FeSCN+2

0.001 0.001 0 -------------------------> initial

-x -x +x -----------------------------> changed

0.001-x 0.001-x x -------------------------> equilibrium

Keq = [FeSCN²⁺] [Fe+3] [SCN-]

0.3948 = x / (0.001-x)^2

0.3948 = x / x^2 + 10^-6 - 0.002 x

0.3948 x^2 - 0.999 x + 3.95 x 10^-7 = 0

x = 3.95 x 10^-7

equilibrium concentrations :

[Fe+3] = 0.001 - x = 9.996 x 10^-4 M

[SCN-] = 0.001 - x = 9.996 x 10^-4 M

[FeSCN+2] = x = 3.95 x 10^-7 M

queen_honey_blossom answered 1 year ago

Next > < Previous

Related Solutions

Use the mean value that you determined for keq to calculate the SCN- concentration in a...

Use the mean value that you determined for keq to calculate the SCN- concentration in a whose initial Fe3+ concentration was 4x10^-2 M and initial SCN- concentration was 1x10^-3 M. Is all of the SCN- in the form of FeNCS2+ My Keq was 451.51

Using the initial concentrations of [Fe(H2O)6]^3+, SCN^-, and the equilibrium concentration of the [Fe(H2O)5SCN]^2+ complex, calculate...

Using the initial concentrations of [Fe(H2O)6]^3+, SCN^-, and the equilibrium concentration of the [Fe(H2O)5SCN]^2+ complex, calculate the equilibrium concentrations of both [Fe(H2O)6]^3+ and SCN^-. All mol/L. Ice table is needed. Initial concentrations of [Fe(H2O)6^3+: Initial concentrations of SCN: [Fe(H2O)5SCN]^2+ equilibrium: Fe(H2O)6 - SCN - EQ Fe(H2O)5SCN 0.390 1.54 23.42 0.390 3.12 35.99 0.390 4.84 58.09 0.390 6.25 74.81 0.390 7.96 98.97

PART D: Study of the Equilibrium: Fe3+(aq) + SCN– (aq) ⇌ [FeSCN] 2+(aq) pale yellow red...

PART D: Study of the Equilibrium: Fe3+(aq) + SCN– (aq) ⇌ [FeSCN] 2+(aq) pale yellow red 20. Which reagent(s) did you use to enhance the formation of [FeSCN] 2+(aq)? Why? 21. Indicate which ion was added to or removed from the equilibrium mixture, based on the reagent(s) you chose in question 20. 22. Which reagent(s) did you use to enhance the formation of Fe3+(aq)? Why? 23. Indicate which ion was added to or removed from the equilibrium mixture, based on...

Lab Experiment 8 Equilibrium II – Le Chatelier’s Principle Part B ‐ Thiocyanate Complexes Given: Fe3+ + SCN‐...

Lab Experiment 8 Equilibrium II – Le Chatelier’s Principle Part B ‐ Thiocyanate Complexes Given: Fe3+ + SCN‐ ⇌ FeSCN2+ Ag+ + SCN‐ ⇌ AgSCN 2. Describe the change observed when silver nitrate is added in step b(b. Add enough AgNO3 to cause a change. Swirl/stir to mix thoroughly) and explain why this change is consistent with Le Chatelier's principle. 3. Describe the change observed when sodium chloride is added in step c (c. Add enough NaCl to cause a change. Swirl/stir to mix...

What kind of shift occurs when you add KNO3 to the equilibirum reaction: Fe3+ + SCN-...

What kind of shift occurs when you add KNO3 to the equilibirum reaction: Fe3+ + SCN- <=> FeSCN2 i know the reaction turns into an orange color

. The equilibrium constant for the reaction below is 7.796 x 10-9. Calculate the equilibrium concentrations...

. The equilibrium constant for the reaction below is 7.796 x 10-9. Calculate the equilibrium concentrations of all species if the initial Co3+ concentration is 0.425 M and the initial SO42- concentration is 0.113 M. 2 Co3+(aq) + 2 SO42-(aq)→← 2 Co2+(aq) + S2O82-(aq)

Please calculate the concentrations of Tartrazine (TZ) and Allura Red (AR) in the unknown mixture using...

Please calculate the concentrations of Tartrazine (TZ) and Allura Red (AR) in the unknown mixture using the coresponding data. Solve by using 2x2 simultaneous linear equation. Slope of TZ at 430 nm = y=0.024x Slope of AR at 430 nm = y=0.0073x Slope of TZ at 480 nm = y=0.0075x Slope of AR at 480 nm = y=0.0183 Absorbance of the unknown mixture at 430 nm = 0.791 Absorbance of the unknown mixture at 480 nm = 0.383 Undiluted molarity...

a. what is your average computed value of the track spacing for CD? Calculate the percent...

a. what is your average computed value of the track spacing for CD? Calculate the percent difference between your measured value and the value specified in the compact disc standard: 3.2 um. b. does you average value of the CD track spacing fall within the tolerance of +- 0.1 um given in the compact disc specification?

Calculate the pH and the equilibrium concentrations of H2AsO4-, HAsO42- and AsO43- in a 0.2920 M...

Calculate the pH and the equilibrium concentrations of H2AsO4-, HAsO42- and AsO43- in a 0.2920 M aqueous arsenic acid solution. For H3AsO4, Ka1 = 2.5×10-4, Ka2 = 5.6×10-8, and Ka3 = 3.0×10-13 pH = _____ [H2AsO4-] = _____ M [HAsO42-] = _____ M [AsO43-] = _____ M

Calculate the pH and the equilibrium concentrations of HCO3- and CO32- in a 0.0514 M carbonic...

Calculate the pH and the equilibrium concentrations of HCO3- and CO32- in a 0.0514 M carbonic acid solution, H2CO3 (aq). For H2CO3, Ka1 = 4.2×10-7 and Ka2 = 4.8×10-11 pH = [HCO3-] = M [CO32-] = M

Subjects