H2SO4 + H2O2 + NaI = H2O + I2 + Na2SO4

H_2SO_4 sulfuric acid + H_2O_2 hydrogen peroxide + NaI sodium iodide ⟶ H_2O water + I_2 iodine + Na_2SO_4 sodium sulfate

Balance the chemical equation algebraically: H_2SO_4 + H_2O_2 + NaI ⟶ H_2O + I_2 + Na_2SO_4 Add stoichiometric coefficients, c_i, to the reactants and products: c_1 H_2SO_4 + c_2 H_2O_2 + c_3 NaI ⟶ c_4 H_2O + c_5 I_2 + c_6 Na_2SO_4 Set the number of atoms in the reactants equal to the number of atoms in the products for H, O, S, I and Na: H: | 2 c_1 + 2 c_2 = 2 c_4 O: | 4 c_1 + 2 c_2 = c_4 + 4 c_6 S: | c_1 = c_6 I: | c_3 = 2 c_5 Na: | c_3 = 2 c_6 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_1 = 1 and solve the system of equations for the remaining coefficients: c_1 = 1 c_2 = 1 c_3 = 2 c_4 = 2 c_5 = 1 c_6 = 1 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | H_2SO_4 + H_2O_2 + 2 NaI ⟶ 2 H_2O + I_2 + Na_2SO_4

+ + ⟶ + +

sulfuric acid + hydrogen peroxide + sodium iodide ⟶ water + iodine + sodium sulfate

ΔG_rxn^0 | -1744 kJ/mol - -1383 kJ/mol = -361.8 kJ/mol (exergonic)

K_c = ([H2O]^2 [I2] [Na2SO4])/([H2SO4] [H2O2] [NaI]^2)

rate = -(Δ[H2SO4])/(Δt) = -(Δ[H2O2])/(Δt) = -1/2 (Δ[NaI])/(Δt) = 1/2 (Δ[H2O])/(Δt) = (Δ[I2])/(Δt) = (Δ[Na2SO4])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)

| sulfuric acid | hydrogen peroxide | sodium iodide | water | iodine | sodium sulfate formula | H_2SO_4 | H_2O_2 | NaI | H_2O | I_2 | Na_2SO_4 Hill formula | H_2O_4S | H_2O_2 | INa | H_2O | I_2 | Na_2O_4S name | sulfuric acid | hydrogen peroxide | sodium iodide | water | iodine | sodium sulfate IUPAC name | sulfuric acid | hydrogen peroxide | sodium iodide | water | molecular iodine | disodium sulfate

| sulfuric acid | hydrogen peroxide | sodium iodide | water | iodine | sodium sulfate molar mass | 98.07 g/mol | 34.014 g/mol | 149.89424 g/mol | 18.015 g/mol | 253.80894 g/mol | 142.04 g/mol phase | liquid (at STP) | liquid (at STP) | solid (at STP) | liquid (at STP) | solid (at STP) | solid (at STP) melting point | 10.371 °C | -0.43 °C | 661 °C | 0 °C | 113 °C | 884 °C boiling point | 279.6 °C | 150.2 °C | 1300 °C | 99.9839 °C | 184 °C | 1429 °C density | 1.8305 g/cm^3 | 1.44 g/cm^3 | 3.67 g/cm^3 | 1 g/cm^3 | 4.94 g/cm^3 | 2.68 g/cm^3 solubility in water | very soluble | miscible | | | | soluble surface tension | 0.0735 N/m | 0.0804 N/m | | 0.0728 N/m | | dynamic viscosity | 0.021 Pa s (at 25 °C) | 0.001249 Pa s (at 20 °C) | 0.0010446 Pa s (at 691 °C) | 8.9×10^-4 Pa s (at 25 °C) | 0.00227 Pa s (at 116 °C) | odor | odorless | | | odorless | |