KMnO4 + C2H2O4 = H2O + CO2 + MnO2 + K2CO3

KMnO_4 potassium permanganate + HO_2CCO_2H oxalic acid ⟶ H_2O water + CO_2 carbon dioxide + MnO_2 manganese dioxide + K_2CO_3 pearl ash

Balance the chemical equation algebraically: KMnO_4 + HO_2CCO_2H ⟶ H_2O + CO_2 + MnO_2 + K_2CO_3 Add stoichiometric coefficients, c_i, to the reactants and products: c_1 KMnO_4 + c_2 HO_2CCO_2H ⟶ c_3 H_2O + c_4 CO_2 + c_5 MnO_2 + c_6 K_2CO_3 Set the number of atoms in the reactants equal to the number of atoms in the products for K, Mn, O, C and H: K: | c_1 = 2 c_6 Mn: | c_1 = c_5 O: | 4 c_1 + 4 c_2 = c_3 + 2 c_4 + 2 c_5 + 3 c_6 C: | 2 c_2 = c_4 + c_6 H: | 2 c_2 = 2 c_3 Since the coefficients are relative quantities and underdetermined, choose a coefficient to set arbitrarily. To keep the coefficients small, the arbitrary value is ordinarily one. For instance, set c_6 = 1 and solve the system of equations for the remaining coefficients: c_1 = 2 c_2 = 3 c_3 = 3 c_4 = 5 c_5 = 2 c_6 = 1 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | 2 KMnO_4 + 3 HO_2CCO_2H ⟶ 3 H_2O + 5 CO_2 + 2 MnO_2 + K_2CO_3

+ ⟶ + + +

potassium permanganate + oxalic acid ⟶ water + carbon dioxide + manganese dioxide + pearl ash

Construct the equilibrium constant, K, expression for: KMnO_4 + HO_2CCO_2H ⟶ H_2O + CO_2 + MnO_2 + K_2CO_3 Plan: • Balance the chemical equation. • Determine the stoichiometric numbers. • Assemble the activity expression for each chemical species. • Use the activity expressions to build the equilibrium constant expression. Write the balanced chemical equation: 2 KMnO_4 + 3 HO_2CCO_2H ⟶ 3 H_2O + 5 CO_2 + 2 MnO_2 + K_2CO_3 Assign stoichiometric numbers, ν_i, using the stoichiometric coefficients, c_i, from the balanced chemical equation in the following manner: ν_i = -c_i for reactants and ν_i = c_i for products: chemical species | c_i | ν_i KMnO_4 | 2 | -2 HO_2CCO_2H | 3 | -3 H_2O | 3 | 3 CO_2 | 5 | 5 MnO_2 | 2 | 2 K_2CO_3 | 1 | 1 Assemble the activity expressions accounting for the state of matter and ν_i: chemical species | c_i | ν_i | activity expression KMnO_4 | 2 | -2 | ([KMnO4])^(-2) HO_2CCO_2H | 3 | -3 | ([HO2CCO2H])^(-3) H_2O | 3 | 3 | ([H2O])^3 CO_2 | 5 | 5 | ([CO2])^5 MnO_2 | 2 | 2 | ([MnO2])^2 K_2CO_3 | 1 | 1 | [K2CO3] The equilibrium constant symbol in the concentration basis is: K_c Mulitply the activity expressions to arrive at the K_c expression: Answer: | | K_c = ([KMnO4])^(-2) ([HO2CCO2H])^(-3) ([H2O])^3 ([CO2])^5 ([MnO2])^2 [K2CO3] = (([H2O])^3 ([CO2])^5 ([MnO2])^2 [K2CO3])/(([KMnO4])^2 ([HO2CCO2H])^3)

Construct the rate of reaction expression for: KMnO_4 + HO_2CCO_2H ⟶ H_2O + CO_2 + MnO_2 + K_2CO_3 Plan: • Balance the chemical equation. • Determine the stoichiometric numbers. • Assemble the rate term for each chemical species. • Write the rate of reaction expression. Write the balanced chemical equation: 2 KMnO_4 + 3 HO_2CCO_2H ⟶ 3 H_2O + 5 CO_2 + 2 MnO_2 + K_2CO_3 Assign stoichiometric numbers, ν_i, using the stoichiometric coefficients, c_i, from the balanced chemical equation in the following manner: ν_i = -c_i for reactants and ν_i = c_i for products: chemical species | c_i | ν_i KMnO_4 | 2 | -2 HO_2CCO_2H | 3 | -3 H_2O | 3 | 3 CO_2 | 5 | 5 MnO_2 | 2 | 2 K_2CO_3 | 1 | 1 The rate term for each chemical species, B_i, is 1/ν_i(Δ[B_i])/(Δt) where [B_i] is the amount concentration and t is time: chemical species | c_i | ν_i | rate term KMnO_4 | 2 | -2 | -1/2 (Δ[KMnO4])/(Δt) HO_2CCO_2H | 3 | -3 | -1/3 (Δ[HO2CCO2H])/(Δt) H_2O | 3 | 3 | 1/3 (Δ[H2O])/(Δt) CO_2 | 5 | 5 | 1/5 (Δ[CO2])/(Δt) MnO_2 | 2 | 2 | 1/2 (Δ[MnO2])/(Δt) K_2CO_3 | 1 | 1 | (Δ[K2CO3])/(Δt) (for infinitesimal rate of change, replace Δ with d) Set the rate terms equal to each other to arrive at the rate expression: Answer: | | rate = -1/2 (Δ[KMnO4])/(Δt) = -1/3 (Δ[HO2CCO2H])/(Δt) = 1/3 (Δ[H2O])/(Δt) = 1/5 (Δ[CO2])/(Δt) = 1/2 (Δ[MnO2])/(Δt) = (Δ[K2CO3])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)

| potassium permanganate | oxalic acid | water | carbon dioxide | manganese dioxide | pearl ash formula | KMnO_4 | HO_2CCO_2H | H_2O | CO_2 | MnO_2 | K_2CO_3 Hill formula | KMnO_4 | C_2H_2O_4 | H_2O | CO_2 | MnO_2 | CK_2O_3 name | potassium permanganate | oxalic acid | water | carbon dioxide | manganese dioxide | pearl ash IUPAC name | potassium permanganate | oxalic acid | water | carbon dioxide | dioxomanganese | dipotassium carbonate