Input interpretation
Na_2CO_3 soda ash + Al_2(SO_4)_3 aluminum sulfate ⟶ Na_2SO_4 sodium sulfate + Al2(CO3)3
Balanced equation
Balance the chemical equation algebraically: Na_2CO_3 + Al_2(SO_4)_3 ⟶ Na_2SO_4 + Al2(CO3)3 Add stoichiometric coefficients, c_i, to the reactants and products: c_1 Na_2CO_3 + c_2 Al_2(SO_4)_3 ⟶ c_3 Na_2SO_4 + c_4 Al2(CO3)3 Set the number of atoms in the reactants equal to the number of atoms in the products for C, Na, O, Al and S: C: | c_1 = 3 c_4 Na: | 2 c_1 = 2 c_3 O: | 3 c_1 + 12 c_2 = 4 c_3 + 9 c_4 Al: | 2 c_2 = 2 c_4 S: | 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_2 = 1 and solve the system of equations for the remaining coefficients: c_1 = 3 c_2 = 1 c_3 = 3 c_4 = 1 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | 3 Na_2CO_3 + Al_2(SO_4)_3 ⟶ 3 Na_2SO_4 + Al2(CO3)3
Structures
+ ⟶ + Al2(CO3)3
Names
soda ash + aluminum sulfate ⟶ sodium sulfate + Al2(CO3)3
Equilibrium constant
Construct the equilibrium constant, K, expression for: Na_2CO_3 + Al_2(SO_4)_3 ⟶ Na_2SO_4 + Al2(CO3)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_2CO_3 + Al_2(SO_4)_3 ⟶ 3 Na_2SO_4 + Al2(CO3)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_2CO_3 | 3 | -3 Al_2(SO_4)_3 | 1 | -1 Na_2SO_4 | 3 | 3 Al2(CO3)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_2CO_3 | 3 | -3 | ([Na2CO3])^(-3) Al_2(SO_4)_3 | 1 | -1 | ([Al2(SO4)3])^(-1) Na_2SO_4 | 3 | 3 | ([Na2SO4])^3 Al2(CO3)3 | 1 | 1 | [Al2(CO3)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 = ([Na2CO3])^(-3) ([Al2(SO4)3])^(-1) ([Na2SO4])^3 [Al2(CO3)3] = (([Na2SO4])^3 [Al2(CO3)3])/(([Na2CO3])^3 [Al2(SO4)3])
Rate of reaction
Construct the rate of reaction expression for: Na_2CO_3 + Al_2(SO_4)_3 ⟶ Na_2SO_4 + Al2(CO3)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_2CO_3 + Al_2(SO_4)_3 ⟶ 3 Na_2SO_4 + Al2(CO3)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_2CO_3 | 3 | -3 Al_2(SO_4)_3 | 1 | -1 Na_2SO_4 | 3 | 3 Al2(CO3)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_2CO_3 | 3 | -3 | -1/3 (Δ[Na2CO3])/(Δt) Al_2(SO_4)_3 | 1 | -1 | -(Δ[Al2(SO4)3])/(Δt) Na_2SO_4 | 3 | 3 | 1/3 (Δ[Na2SO4])/(Δt) Al2(CO3)3 | 1 | 1 | (Δ[Al2(CO3)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[Na2CO3])/(Δt) = -(Δ[Al2(SO4)3])/(Δt) = 1/3 (Δ[Na2SO4])/(Δt) = (Δ[Al2(CO3)3])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)
Chemical names and formulas
| soda ash | aluminum sulfate | sodium sulfate | Al2(CO3)3 formula | Na_2CO_3 | Al_2(SO_4)_3 | Na_2SO_4 | Al2(CO3)3 Hill formula | CNa_2O_3 | Al_2O_12S_3 | Na_2O_4S | C3Al2O9 name | soda ash | aluminum sulfate | sodium sulfate | IUPAC name | disodium carbonate | dialuminum trisulfate | disodium sulfate |
Substance properties
| soda ash | aluminum sulfate | sodium sulfate | Al2(CO3)3 molar mass | 105.99 g/mol | 342.1 g/mol | 142.04 g/mol | 233.99 g/mol phase | solid (at STP) | solid (at STP) | solid (at STP) | melting point | 851 °C | 770 °C | 884 °C | boiling point | 1600 °C | | 1429 °C | density | | 2.71 g/cm^3 | 2.68 g/cm^3 | solubility in water | soluble | soluble | soluble | dynamic viscosity | 0.00355 Pa s (at 900 °C) | | |
Units