Input interpretation
H_2SO_4 sulfuric acid + KClO_4 potassium perchlorate ⟶ K_2SO_4 potassium sulfate + HClO_4 perchloric acid
Balanced equation
Balance the chemical equation algebraically: H_2SO_4 + KClO_4 ⟶ K_2SO_4 + HClO_4 Add stoichiometric coefficients, c_i, to the reactants and products: c_1 H_2SO_4 + c_2 KClO_4 ⟶ c_3 K_2SO_4 + c_4 HClO_4 Set the number of atoms in the reactants equal to the number of atoms in the products for H, O, S, Cl and K: H: | 2 c_1 = c_4 O: | 4 c_1 + 4 c_2 = 4 c_3 + 4 c_4 S: | c_1 = c_3 Cl: | c_2 = c_4 K: | c_2 = 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_1 = 1 and solve the system of equations for the remaining coefficients: c_1 = 1 c_2 = 2 c_3 = 1 c_4 = 2 Substitute the coefficients into the chemical reaction to obtain the balanced equation: Answer: | | H_2SO_4 + 2 KClO_4 ⟶ K_2SO_4 + 2 HClO_4
Structures
+ ⟶ +
Names
sulfuric acid + potassium perchlorate ⟶ potassium sulfate + perchloric acid
Equilibrium constant
Construct the equilibrium constant, K, expression for: H_2SO_4 + KClO_4 ⟶ K_2SO_4 + HClO_4 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: H_2SO_4 + 2 KClO_4 ⟶ K_2SO_4 + 2 HClO_4 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 H_2SO_4 | 1 | -1 KClO_4 | 2 | -2 K_2SO_4 | 1 | 1 HClO_4 | 2 | 2 Assemble the activity expressions accounting for the state of matter and ν_i: chemical species | c_i | ν_i | activity expression H_2SO_4 | 1 | -1 | ([H2SO4])^(-1) KClO_4 | 2 | -2 | ([KClO4])^(-2) K_2SO_4 | 1 | 1 | [K2SO4] HClO_4 | 2 | 2 | ([HClO4])^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 = ([H2SO4])^(-1) ([KClO4])^(-2) [K2SO4] ([HClO4])^2 = ([K2SO4] ([HClO4])^2)/([H2SO4] ([KClO4])^2)
Rate of reaction
Construct the rate of reaction expression for: H_2SO_4 + KClO_4 ⟶ K_2SO_4 + HClO_4 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: H_2SO_4 + 2 KClO_4 ⟶ K_2SO_4 + 2 HClO_4 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 H_2SO_4 | 1 | -1 KClO_4 | 2 | -2 K_2SO_4 | 1 | 1 HClO_4 | 2 | 2 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 H_2SO_4 | 1 | -1 | -(Δ[H2SO4])/(Δt) KClO_4 | 2 | -2 | -1/2 (Δ[KClO4])/(Δt) K_2SO_4 | 1 | 1 | (Δ[K2SO4])/(Δt) HClO_4 | 2 | 2 | 1/2 (Δ[HClO4])/(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[H2SO4])/(Δt) = -1/2 (Δ[KClO4])/(Δt) = (Δ[K2SO4])/(Δt) = 1/2 (Δ[HClO4])/(Δt) (assuming constant volume and no accumulation of intermediates or side products)
Chemical names and formulas
| sulfuric acid | potassium perchlorate | potassium sulfate | perchloric acid formula | H_2SO_4 | KClO_4 | K_2SO_4 | HClO_4 Hill formula | H_2O_4S | ClKO_4 | K_2O_4S | ClHO_4 name | sulfuric acid | potassium perchlorate | potassium sulfate | perchloric acid IUPAC name | sulfuric acid | potassium perchlorate | dipotassium sulfate | perchloric acid
Substance properties
| sulfuric acid | potassium perchlorate | potassium sulfate | perchloric acid molar mass | 98.07 g/mol | 138.54 g/mol | 174.25 g/mol | 100.5 g/mol phase | liquid (at STP) | solid (at STP) | | liquid (at STP) melting point | 10.371 °C | 400 °C | | -112 °C boiling point | 279.6 °C | | | 90 °C density | 1.8305 g/cm^3 | 2.5239 g/cm^3 | | 1.77 g/cm^3 solubility in water | very soluble | | soluble | very soluble surface tension | 0.0735 N/m | | | dynamic viscosity | 0.021 Pa s (at 25 °C) | | | 8×10^-4 Pa s (at 25 °C) odor | odorless | | | odorless
Units