NaClO = O2 + NaCl

NaOCl sodium hypochlorite ⟶ O_2 oxygen + NaCl sodium chloride

Balance the chemical equation algebraically: NaOCl ⟶ O_2 + NaCl Add stoichiometric coefficients, c_i, to the reactants and products: c_1 NaOCl ⟶ c_2 O_2 + c_3 NaCl Set the number of atoms in the reactants equal to the number of atoms in the products for Cl, Na and O: Cl: | c_1 = c_3 Na: | c_1 = c_3 O: | c_1 = 2 c_2 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_2 = 1 and solve the system of equations for the remaining coefficients: c_1 = 2 c_2 = 1 c_3 = 2 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | 2 NaOCl ⟶ O_2 + 2 NaCl

⟶ +

sodium hypochlorite ⟶ oxygen + sodium chloride

Construct the equilibrium constant, K, expression for: NaOCl ⟶ O_2 + NaCl 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 NaOCl ⟶ O_2 + 2 NaCl 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 NaOCl | 2 | -2 O_2 | 1 | 1 NaCl | 2 | 2 Assemble the activity expressions accounting for the state of matter and ν_i: chemical species | c_i | ν_i | activity expression NaOCl | 2 | -2 | ([NaOCl])^(-2) O_2 | 1 | 1 | [O2] NaCl | 2 | 2 | ([NaCl])^2 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 = ([NaOCl])^(-2) [O2] ([NaCl])^2 = ([O2] ([NaCl])^2)/([NaOCl])^2

Construct the rate of reaction expression for: NaOCl ⟶ O_2 + NaCl 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 NaOCl ⟶ O_2 + 2 NaCl 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 NaOCl | 2 | -2 O_2 | 1 | 1 NaCl | 2 | 2 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 NaOCl | 2 | -2 | -1/2 (Δ[NaOCl])/(Δt) O_2 | 1 | 1 | (Δ[O2])/(Δt) NaCl | 2 | 2 | 1/2 (Δ[NaCl])/(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[NaOCl])/(Δt) = (Δ[O2])/(Δt) = 1/2 (Δ[NaCl])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)

| sodium hypochlorite | oxygen | sodium chloride formula | NaOCl | O_2 | NaCl Hill formula | ClNaO | O_2 | ClNa name | sodium hypochlorite | oxygen | sodium chloride IUPAC name | sodium hypochlorite | molecular oxygen | sodium chloride

| sodium hypochlorite | oxygen | sodium chloride molar mass | 74.44 g/mol | 31.998 g/mol | 58.44 g/mol phase | liquid (at STP) | gas (at STP) | solid (at STP) melting point | -6 °C | -218 °C | 801 °C boiling point | | -183 °C | 1413 °C density | 1.11 g/cm^3 | 0.001429 g/cm^3 (at 0 °C) | 2.16 g/cm^3 solubility in water | miscible | | soluble surface tension | | 0.01347 N/m | dynamic viscosity | | 2.055×10^-5 Pa s (at 25 °C) | odor | | odorless | odorless