Exp. 7 Equilibrium Determination

• Concentration of all reactants and products remain constant over time.
• Concentration of reactants and products are constant because rate of forward and rate of reverse reaction is same.
• Equilibrium favors products (right) or reactants (left) depends on given reaction and temperature.
• Constant K

  A) [A]^A

  B) [B]^b

  C) [C]^c

  D) [D]^d

  
• Generic reaction

  A, B=reactions

  C, D=products

  a,b,c,d = respective coeficients

  A) aA

  B) bB

  C) cC

  D) dD

  
• Reaction equation of FeSCN^2+

  A) Fe^3+(aq)

  B) SCN-(aq)

  C) FeSCN^2+(aq)

  D) colorless

  E) colorless

  F) red

  
• Concentration of reactants

  A) Fe^3+initial

  B) -

  C) FeSCN^2+(eq)

  D) -

  E) FeSCN^2+(eq)

  F) SCN-initial

  G) SCN-(eq)

  H) Fe^3+(eq)

  
• Equilibrium expression for reaction

  A) K

  B) FeSCN^2+(eq)

  C) Fe^3+(eq)

  D) SCN-(eq)

  
• equipment used:

  Mohr pipette, cuvette, spectrophotometer, parafilm, kimwipe
• Primary factor that determines the equilibrium constant (K) is concentration of reactant and product
• $FeSCN^2+$is detected under UV-Vis spectroscopy
• In the context of UV-Vis spectroscopy fo determining the equilibrium constant (K) for an iron reaction the absorbance of light is commonly measured.