The proper expression for the equilibrium constant of the reaction is to be stated. Concept introduction: Equilibrium constant for a chemical reaction defines the extent of reaction. It is the ratio of concentration of products formed to the concentration of reactants with time which is expressed in terms of activity and molarity. The equilibrium constant is constant at a specified temperature and pure solids and pure liquids are not taken in the expression for equilibrium constant. In order to get a unitless quantity, the whole product is divided by the standard molal concentration.
Definition Definition Number that is expressed before molecules, ions, and atoms such that it balances out the number of components present on either section of the equation in a chemical reaction. Stoichiometric coefficients can be a fraction or a whole number and are useful in determining the mole ratio among the reactants and products. In any equalized chemical equation, the number of components on either side of the equation will be the same.
Chapter 5, Problem 5.31E
(a)
Interpretation Introduction
Interpretation:
The proper expression for the equilibrium constant of the reaction is to be stated.
Concept introduction:
Equilibrium constant for a chemical reaction defines the extent of reaction. It is the ratio of concentration of products formed to the concentration of reactants with time which is expressed in terms of activity and molarity. The equilibrium constant is constant at a specified temperature and pure solids and pure liquids are not taken in the expression for equilibrium constant. In order to get a unitless quantity, the whole product is divided by the standard molal concentration.
(a)
Expert Solution
Answer to Problem 5.31E
The expression for equilibrium constant for the reaction PbCl2(s)⇌Pb2+(aq)+2Cl-(aq) is given below.
Keq=[γPb2+mPb2+m°][γCl−mCl−m°]2γPbCl2mPbCl2mο
Explanation of Solution
The equilibrium constant for the given reaction can be expressed as the product of the concentration of products as given below.
Keq=[γPb2+mPb2+m°][γCl−mCl−m°]2γPbCl2mPbCl2mο
In the above expression, Keq is the equilibrium constant and the square brackets represent the concentrations of products (Pb2+ and Cl-). The power of 2 at [Cl−]2 is due to its stoichiometric coefficient in the reaction. The term mο represents the standard molal concentration. Since PbCl2 is in the solid form, so it will be taken as 1 in the equilibrium constant for the reaction.
Conclusion
The equilibrium constant for the given reaction is Keq=[γPb2+mPb2+m°][γCl-mCl-m°]2γPbCl2mPbCl2mο.
(b)
Interpretation Introduction
Interpretation:
The proper expression for the equilibrium constant of the reaction is to be stated.
Concept introduction:
Equilibrium constant for a chemical reaction defines the extent of reaction. It is the ratio of concentration of products formed to the concentration of reactants with time which is expressed in terms of activity and molarity. The equilibrium constant is constant at a specified temperature and pure solids and pure liquids are not taken in the expression for equilibrium constant.
(b)
Expert Solution
Answer to Problem 5.31E
The expression for equilibrium constant for the reaction HNO2(aq)⇌H+(aq)+NO2−(aq) is given below.
Keq=[γH+mH+m°][γNO2-mNO2-m°][γHNO2mHNO2m°].
Explanation of Solution
The equilibrium constant for the given reaction can be expressed as the ratio of the product of the concentration of products to the product of the concentration of reactants that is:
Keq=[γH+mH+m°][γNO2−mNO2−m°][γHNO2mHNO2m°]
In the above expression, Keq is the equilibrium constant and the square brackets represent the concentrations of products and reactants, that is H+, NO2− and HNO2. The term mο represents the standard molal concentration. Since the stoichiometric coefficient of the reactants and the product is 1 therefore, it is taken as the direct product.
Conclusion
The equilibrium constant for the given reaction is Keq=[γH+mH+m°][γNO2-mNO2-m°][γHNO2mHNO2m°].
(c)
Interpretation Introduction
Interpretation:
The proper expression for the equilibrium constant of the reaction is to bestated.
Concept introduction:
Equilibrium constant for a chemical reaction defines the extent of reaction. It is the ratio of concentration of products formed to the concentration of reactants with time which is expressed in terms of activity and molarity. The equilibrium constant is constant at a specified temperature and pure solids and pure liquids are not taken in the expression for equilibrium constant.
(c)
Expert Solution
Answer to Problem 5.31E
The expression for equilibrium constant for the given reaction CaCO3(s)+H2C2O4(aq)⇌CaC2O4(s)+H2O(l)+CO2(g) is given below.
Keq=pCO2p°[γH2C2O4mH2C2O4m°]
Explanation of Solution
The equilibrium constant for the given reaction can be expressed as the ratio of the product of the concentration of products to the product of the concentration of reactants that is,
Keq=pCO2p°[γH2C2O4mH2C2O4m°]
In the above expression, Keq is the equilibrium constant, pCO2 is the partial pressure of carbon dioxide gas evolved as a product in the reaction and [H2C2O4] is the concentration of reactant. The term mο represents the standard molal concentration. In case of gaseous reactants or products, their partial pressure is taken instead of molar concentrations.
Conclusion
The equilibrium constant for the given reaction is Keq=pCO2p°[γH2C2O4mH2C2O4m°].
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