Input interpretation
Na_2SO_4 sodium sulfate + AlCl_3 aluminum chloride ⟶ NaCl sodium chloride + Al_2(SO_4)_3 aluminum sulfate
Balanced equation
Balance the chemical equation algebraically: Na_2SO_4 + AlCl_3 ⟶ NaCl + Al_2(SO_4)_3 Add stoichiometric coefficients, c_i, to the reactants and products: c_1 Na_2SO_4 + c_2 AlCl_3 ⟶ c_3 NaCl + c_4 Al_2(SO_4)_3 Set the number of atoms in the reactants equal to the number of atoms in the products for Na, O, S, Al and Cl: Na: | 2 c_1 = c_3 O: | 4 c_1 = 12 c_4 S: | c_1 = 3 c_4 Al: | c_2 = 2 c_4 Cl: | 3 c_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_4 = 1 and solve the system of equations for the remaining coefficients: c_1 = 3 c_2 = 2 c_3 = 6 c_4 = 1 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | 3 Na_2SO_4 + 2 AlCl_3 ⟶ 6 NaCl + Al_2(SO_4)_3
Structures
+ ⟶ +
Names
sodium sulfate + aluminum chloride ⟶ sodium chloride + aluminum sulfate
Equilibrium constant
Construct the equilibrium constant, K, expression for: Na_2SO_4 + AlCl_3 ⟶ NaCl + Al_2(SO_4)_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: 3 Na_2SO_4 + 2 AlCl_3 ⟶ 6 NaCl + Al_2(SO_4)_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 Na_2SO_4 | 3 | -3 AlCl_3 | 2 | -2 NaCl | 6 | 6 Al_2(SO_4)_3 | 1 | 1 Assemble the activity expressions accounting for the state of matter and ν_i: chemical species | c_i | ν_i | activity expression Na_2SO_4 | 3 | -3 | ([Na2SO4])^(-3) AlCl_3 | 2 | -2 | ([AlCl3])^(-2) NaCl | 6 | 6 | ([NaCl])^6 Al_2(SO_4)_3 | 1 | 1 | [Al2(SO4)3] 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 = ([Na2SO4])^(-3) ([AlCl3])^(-2) ([NaCl])^6 [Al2(SO4)3] = (([NaCl])^6 [Al2(SO4)3])/(([Na2SO4])^3 ([AlCl3])^2)
Rate of reaction
Construct the rate of reaction expression for: Na_2SO_4 + AlCl_3 ⟶ NaCl + Al_2(SO_4)_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: 3 Na_2SO_4 + 2 AlCl_3 ⟶ 6 NaCl + Al_2(SO_4)_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 Na_2SO_4 | 3 | -3 AlCl_3 | 2 | -2 NaCl | 6 | 6 Al_2(SO_4)_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 Na_2SO_4 | 3 | -3 | -1/3 (Δ[Na2SO4])/(Δt) AlCl_3 | 2 | -2 | -1/2 (Δ[AlCl3])/(Δt) NaCl | 6 | 6 | 1/6 (Δ[NaCl])/(Δt) Al_2(SO_4)_3 | 1 | 1 | (Δ[Al2(SO4)3])/(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 = -1/3 (Δ[Na2SO4])/(Δt) = -1/2 (Δ[AlCl3])/(Δt) = 1/6 (Δ[NaCl])/(Δt) = (Δ[Al2(SO4)3])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)
Chemical names and formulas
| sodium sulfate | aluminum chloride | sodium chloride | aluminum sulfate formula | Na_2SO_4 | AlCl_3 | NaCl | Al_2(SO_4)_3 Hill formula | Na_2O_4S | AlCl_3 | ClNa | Al_2O_12S_3 name | sodium sulfate | aluminum chloride | sodium chloride | aluminum sulfate IUPAC name | disodium sulfate | trichloroalumane | sodium chloride | dialuminum trisulfate
Substance properties
| sodium sulfate | aluminum chloride | sodium chloride | aluminum sulfate molar mass | 142.04 g/mol | 133.3 g/mol | 58.44 g/mol | 342.1 g/mol phase | solid (at STP) | solid (at STP) | solid (at STP) | solid (at STP) melting point | 884 °C | 190 °C | 801 °C | 770 °C boiling point | 1429 °C | | 1413 °C | density | 2.68 g/cm^3 | | 2.16 g/cm^3 | 2.71 g/cm^3 solubility in water | soluble | | soluble | soluble odor | | | odorless |
Units