NaOH + NH3 = H2O + NH2Na

NaOH sodium hydroxide + NH_3 ammonia ⟶ H_2O water + NaNH_2 sodium amide

Balance the chemical equation algebraically: NaOH + NH_3 ⟶ H_2O + NaNH_2 Add stoichiometric coefficients, c_i, to the reactants and products: c_1 NaOH + c_2 NH_3 ⟶ c_3 H_2O + c_4 NaNH_2 Set the number of atoms in the reactants equal to the number of atoms in the products for H, Na, O and N: H: | c_1 + 3 c_2 = 2 c_3 + 2 c_4 Na: | c_1 = c_4 O: | c_1 = c_3 N: | c_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_1 = 1 and solve the system of equations for the remaining coefficients: c_1 = 1 c_2 = 1 c_3 = 1 c_4 = 1 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | NaOH + NH_3 ⟶ H_2O + NaNH_2

+ ⟶ +

sodium hydroxide + ammonia ⟶ water + sodium amide

| sodium hydroxide | ammonia | water | sodium amide molecular enthalpy | -425.8 kJ/mol | -45.9 kJ/mol | -285.8 kJ/mol | -123.8 kJ/mol total enthalpy | -425.8 kJ/mol | -45.9 kJ/mol | -285.8 kJ/mol | -123.8 kJ/mol | H_initial = -471.7 kJ/mol | | H_final = -409.6 kJ/mol | ΔH_rxn^0 | -409.6 kJ/mol - -471.7 kJ/mol = 62.07 kJ/mol (endothermic) | | |

| sodium hydroxide | ammonia | water | sodium amide molecular free energy | -379.7 kJ/mol | -16.4 kJ/mol | -237.1 kJ/mol | -64 kJ/mol total free energy | -379.7 kJ/mol | -16.4 kJ/mol | -237.1 kJ/mol | -64 kJ/mol | G_initial = -396.1 kJ/mol | | G_final = -301.1 kJ/mol | ΔG_rxn^0 | -301.1 kJ/mol - -396.1 kJ/mol = 95 kJ/mol (endergonic) | | |

Construct the equilibrium constant, K, expression for: NaOH + NH_3 ⟶ H_2O + NaNH_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: NaOH + NH_3 ⟶ H_2O + NaNH_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 | 1 | -1 NH_3 | 1 | -1 H_2O | 1 | 1 NaNH_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 | 1 | -1 | ([NaOH])^(-1) NH_3 | 1 | -1 | ([NH3])^(-1) H_2O | 1 | 1 | [H2O] NaNH_2 | 1 | 1 | [NaNH2] 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])^(-1) ([NH3])^(-1) [H2O] [NaNH2] = ([H2O] [NaNH2])/([NaOH] [NH3])

Construct the rate of reaction expression for: NaOH + NH_3 ⟶ H_2O + NaNH_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: NaOH + NH_3 ⟶ H_2O + NaNH_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 | 1 | -1 NH_3 | 1 | -1 H_2O | 1 | 1 NaNH_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 | 1 | -1 | -(Δ[NaOH])/(Δt) NH_3 | 1 | -1 | -(Δ[NH3])/(Δt) H_2O | 1 | 1 | (Δ[H2O])/(Δt) NaNH_2 | 1 | 1 | (Δ[NaNH2])/(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 = -(Δ[NaOH])/(Δt) = -(Δ[NH3])/(Δt) = (Δ[H2O])/(Δt) = (Δ[NaNH2])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)

| sodium hydroxide | ammonia | water | sodium amide formula | NaOH | NH_3 | H_2O | NaNH_2 Hill formula | HNaO | H_3N | H_2O | H_2NNa name | sodium hydroxide | ammonia | water | sodium amide IUPAC name | sodium hydroxide | ammonia | water | sodium azanide

| sodium hydroxide | ammonia | water | sodium amide molar mass | 39.997 g/mol | 17.031 g/mol | 18.015 g/mol | 39.013 g/mol phase | solid (at STP) | gas (at STP) | liquid (at STP) | solid (at STP) melting point | 323 °C | -77.73 °C | 0 °C | 210 °C boiling point | 1390 °C | -33.33 °C | 99.9839 °C | 400 °C density | 2.13 g/cm^3 | 6.96×10^-4 g/cm^3 (at 25 °C) | 1 g/cm^3 | 1.39 g/cm^3 solubility in water | soluble | | | reacts surface tension | 0.07435 N/m | 0.0234 N/m | 0.0728 N/m | dynamic viscosity | 0.004 Pa s (at 350 °C) | 1.009×10^-5 Pa s (at 25 °C) | 8.9×10^-4 Pa s (at 25 °C) | odor | | | odorless |