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Mg(OH)2 + H3PO3 = H2O + Mg3(PO3)2

Input interpretation

Mg(OH)_2 magnesium hydroxide + HP(O)(OH)_2 phosphorous acid ⟶ H_2O water + Mg3(PO3)2
Mg(OH)_2 magnesium hydroxide + HP(O)(OH)_2 phosphorous acid ⟶ H_2O water + Mg3(PO3)2

Balanced equation

Balance the chemical equation algebraically: Mg(OH)_2 + HP(O)(OH)_2 ⟶ H_2O + Mg3(PO3)2 Add stoichiometric coefficients, c_i, to the reactants and products: c_1 Mg(OH)_2 + c_2 HP(O)(OH)_2 ⟶ c_3 H_2O + c_4 Mg3(PO3)2 Set the number of atoms in the reactants equal to the number of atoms in the products for H, Mg, O and P: H: | 2 c_1 + 3 c_2 = 2 c_3 Mg: | c_1 = 3 c_4 O: | 2 c_1 + 3 c_2 = c_3 + 6 c_4 P: | c_2 = 2 c_4 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 Mg(OH)_2 + 2 HP(O)(OH)_2 ⟶ 6 H_2O + Mg3(PO3)2
Balance the chemical equation algebraically: Mg(OH)_2 + HP(O)(OH)_2 ⟶ H_2O + Mg3(PO3)2 Add stoichiometric coefficients, c_i, to the reactants and products: c_1 Mg(OH)_2 + c_2 HP(O)(OH)_2 ⟶ c_3 H_2O + c_4 Mg3(PO3)2 Set the number of atoms in the reactants equal to the number of atoms in the products for H, Mg, O and P: H: | 2 c_1 + 3 c_2 = 2 c_3 Mg: | c_1 = 3 c_4 O: | 2 c_1 + 3 c_2 = c_3 + 6 c_4 P: | c_2 = 2 c_4 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 Mg(OH)_2 + 2 HP(O)(OH)_2 ⟶ 6 H_2O + Mg3(PO3)2

Structures

+ ⟶ + Mg3(PO3)2
+ ⟶ + Mg3(PO3)2

Names

magnesium hydroxide + phosphorous acid ⟶ water + Mg3(PO3)2
magnesium hydroxide + phosphorous acid ⟶ water + Mg3(PO3)2

Equilibrium constant

Construct the equilibrium constant, K, expression for: Mg(OH)_2 + HP(O)(OH)_2 ⟶ H_2O + Mg3(PO3)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: 3 Mg(OH)_2 + 2 HP(O)(OH)_2 ⟶ 6 H_2O + Mg3(PO3)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 Mg(OH)_2 | 3 | -3 HP(O)(OH)_2 | 2 | -2 H_2O | 6 | 6 Mg3(PO3)2 | 1 | 1 Assemble the activity expressions accounting for the state of matter and ν_i: chemical species | c_i | ν_i | activity expression Mg(OH)_2 | 3 | -3 | ([Mg(OH)2])^(-3) HP(O)(OH)_2 | 2 | -2 | ([HP(O)(OH)2])^(-2) H_2O | 6 | 6 | ([H2O])^6 Mg3(PO3)2 | 1 | 1 | [Mg3(PO3)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 = ([Mg(OH)2])^(-3) ([HP(O)(OH)2])^(-2) ([H2O])^6 [Mg3(PO3)2] = (([H2O])^6 [Mg3(PO3)2])/(([Mg(OH)2])^3 ([HP(O)(OH)2])^2)
Construct the equilibrium constant, K, expression for: Mg(OH)_2 + HP(O)(OH)_2 ⟶ H_2O + Mg3(PO3)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: 3 Mg(OH)_2 + 2 HP(O)(OH)_2 ⟶ 6 H_2O + Mg3(PO3)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 Mg(OH)_2 | 3 | -3 HP(O)(OH)_2 | 2 | -2 H_2O | 6 | 6 Mg3(PO3)2 | 1 | 1 Assemble the activity expressions accounting for the state of matter and ν_i: chemical species | c_i | ν_i | activity expression Mg(OH)_2 | 3 | -3 | ([Mg(OH)2])^(-3) HP(O)(OH)_2 | 2 | -2 | ([HP(O)(OH)2])^(-2) H_2O | 6 | 6 | ([H2O])^6 Mg3(PO3)2 | 1 | 1 | [Mg3(PO3)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 = ([Mg(OH)2])^(-3) ([HP(O)(OH)2])^(-2) ([H2O])^6 [Mg3(PO3)2] = (([H2O])^6 [Mg3(PO3)2])/(([Mg(OH)2])^3 ([HP(O)(OH)2])^2)

Rate of reaction

Construct the rate of reaction expression for: Mg(OH)_2 + HP(O)(OH)_2 ⟶ H_2O + Mg3(PO3)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: 3 Mg(OH)_2 + 2 HP(O)(OH)_2 ⟶ 6 H_2O + Mg3(PO3)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 Mg(OH)_2 | 3 | -3 HP(O)(OH)_2 | 2 | -2 H_2O | 6 | 6 Mg3(PO3)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 Mg(OH)_2 | 3 | -3 | -1/3 (Δ[Mg(OH)2])/(Δt) HP(O)(OH)_2 | 2 | -2 | -1/2 (Δ[HP(O)(OH)2])/(Δt) H_2O | 6 | 6 | 1/6 (Δ[H2O])/(Δt) Mg3(PO3)2 | 1 | 1 | (Δ[Mg3(PO3)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 = -1/3 (Δ[Mg(OH)2])/(Δt) = -1/2 (Δ[HP(O)(OH)2])/(Δt) = 1/6 (Δ[H2O])/(Δt) = (Δ[Mg3(PO3)2])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)
Construct the rate of reaction expression for: Mg(OH)_2 + HP(O)(OH)_2 ⟶ H_2O + Mg3(PO3)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: 3 Mg(OH)_2 + 2 HP(O)(OH)_2 ⟶ 6 H_2O + Mg3(PO3)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 Mg(OH)_2 | 3 | -3 HP(O)(OH)_2 | 2 | -2 H_2O | 6 | 6 Mg3(PO3)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 Mg(OH)_2 | 3 | -3 | -1/3 (Δ[Mg(OH)2])/(Δt) HP(O)(OH)_2 | 2 | -2 | -1/2 (Δ[HP(O)(OH)2])/(Δt) H_2O | 6 | 6 | 1/6 (Δ[H2O])/(Δt) Mg3(PO3)2 | 1 | 1 | (Δ[Mg3(PO3)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 = -1/3 (Δ[Mg(OH)2])/(Δt) = -1/2 (Δ[HP(O)(OH)2])/(Δt) = 1/6 (Δ[H2O])/(Δt) = (Δ[Mg3(PO3)2])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)

Chemical names and formulas

| magnesium hydroxide | phosphorous acid | water | Mg3(PO3)2 formula | Mg(OH)_2 | HP(O)(OH)_2 | H_2O | Mg3(PO3)2 Hill formula | H_2MgO_2 | H_3O_3P | H_2O | Mg3O6P2 name | magnesium hydroxide | phosphorous acid | water | IUPAC name | magnesium dihydroxide | phosphorous acid | water |
| magnesium hydroxide | phosphorous acid | water | Mg3(PO3)2 formula | Mg(OH)_2 | HP(O)(OH)_2 | H_2O | Mg3(PO3)2 Hill formula | H_2MgO_2 | H_3O_3P | H_2O | Mg3O6P2 name | magnesium hydroxide | phosphorous acid | water | IUPAC name | magnesium dihydroxide | phosphorous acid | water |

Substance properties

| magnesium hydroxide | phosphorous acid | water | Mg3(PO3)2 molar mass | 58.319 g/mol | 81.995 g/mol | 18.015 g/mol | 230.86 g/mol phase | solid (at STP) | solid (at STP) | liquid (at STP) | melting point | 350 °C | 74 °C | 0 °C | boiling point | | | 99.9839 °C | density | 2.3446 g/cm^3 | 1.597 g/cm^3 | 1 g/cm^3 | solubility in water | insoluble | | | surface tension | | | 0.0728 N/m | dynamic viscosity | | | 8.9×10^-4 Pa s (at 25 °C) | odor | | | odorless |
| magnesium hydroxide | phosphorous acid | water | Mg3(PO3)2 molar mass | 58.319 g/mol | 81.995 g/mol | 18.015 g/mol | 230.86 g/mol phase | solid (at STP) | solid (at STP) | liquid (at STP) | melting point | 350 °C | 74 °C | 0 °C | boiling point | | | 99.9839 °C | density | 2.3446 g/cm^3 | 1.597 g/cm^3 | 1 g/cm^3 | solubility in water | insoluble | | | surface tension | | | 0.0728 N/m | dynamic viscosity | | | 8.9×10^-4 Pa s (at 25 °C) | odor | | | odorless |

Units

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