Input interpretation
NaOH sodium hydroxide + CuSO3 ⟶ Na_2SO_3 sodium sulfite + Cu(OH)_2 copper hydroxide
Balanced equation
Balance the chemical equation algebraically: NaOH + CuSO3 ⟶ Na_2SO_3 + Cu(OH)_2 Add stoichiometric coefficients, c_i, to the reactants and products: c_1 NaOH + c_2 CuSO3 ⟶ c_3 Na_2SO_3 + c_4 Cu(OH)_2 Set the number of atoms in the reactants equal to the number of atoms in the products for H, Na, O, Cu and S: H: | c_1 = 2 c_4 Na: | c_1 = 2 c_3 O: | c_1 + 3 c_2 = 3 c_3 + 2 c_4 Cu: | c_2 = c_4 S: | 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 = 2 c_2 = 1 c_3 = 1 c_4 = 1 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | 2 NaOH + CuSO3 ⟶ Na_2SO_3 + Cu(OH)_2
Structures
+ CuSO3 ⟶ +
Names
sodium hydroxide + CuSO3 ⟶ sodium sulfite + copper hydroxide
Equilibrium constant
Construct the equilibrium constant, K, expression for: NaOH + CuSO3 ⟶ Na_2SO_3 + Cu(OH)_2 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 NaOH + CuSO3 ⟶ Na_2SO_3 + Cu(OH)_2 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 NaOH | 2 | -2 CuSO3 | 1 | -1 Na_2SO_3 | 1 | 1 Cu(OH)_2 | 1 | 1 Assemble the activity expressions accounting for the state of matter and ν_i: chemical species | c_i | ν_i | activity expression NaOH | 2 | -2 | ([NaOH])^(-2) CuSO3 | 1 | -1 | ([CuSO3])^(-1) Na_2SO_3 | 1 | 1 | [Na2SO3] Cu(OH)_2 | 1 | 1 | [Cu(OH)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 = ([NaOH])^(-2) ([CuSO3])^(-1) [Na2SO3] [Cu(OH)2] = ([Na2SO3] [Cu(OH)2])/(([NaOH])^2 [CuSO3])
Rate of reaction
Construct the rate of reaction expression for: NaOH + CuSO3 ⟶ Na_2SO_3 + Cu(OH)_2 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 NaOH + CuSO3 ⟶ Na_2SO_3 + Cu(OH)_2 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 NaOH | 2 | -2 CuSO3 | 1 | -1 Na_2SO_3 | 1 | 1 Cu(OH)_2 | 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 NaOH | 2 | -2 | -1/2 (Δ[NaOH])/(Δt) CuSO3 | 1 | -1 | -(Δ[CuSO3])/(Δt) Na_2SO_3 | 1 | 1 | (Δ[Na2SO3])/(Δt) Cu(OH)_2 | 1 | 1 | (Δ[Cu(OH)2])/(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[NaOH])/(Δt) = -(Δ[CuSO3])/(Δt) = (Δ[Na2SO3])/(Δt) = (Δ[Cu(OH)2])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)
Chemical names and formulas
| sodium hydroxide | CuSO3 | sodium sulfite | copper hydroxide formula | NaOH | CuSO3 | Na_2SO_3 | Cu(OH)_2 Hill formula | HNaO | CuO3S | Na_2O_3S | CuH_2O_2 name | sodium hydroxide | | sodium sulfite | copper hydroxide IUPAC name | sodium hydroxide | | disodium sulfite | copper dihydroxide
Substance properties
| sodium hydroxide | CuSO3 | sodium sulfite | copper hydroxide molar mass | 39.997 g/mol | 143.6 g/mol | 126.04 g/mol | 97.56 g/mol phase | solid (at STP) | | solid (at STP) | melting point | 323 °C | | 500 °C | boiling point | 1390 °C | | | density | 2.13 g/cm^3 | | 2.63 g/cm^3 | solubility in water | soluble | | | surface tension | 0.07435 N/m | | | dynamic viscosity | 0.004 Pa s (at 350 °C) | | |
Units