Question

Write the equation for the equilibrium that corresponds to each of the following reaction quotients.

Answer 1

Answer:

a.

$H_2+Cl_2\rightleftharpoons 2HCl$

b.

$H^++F^-\rightleftharpoons HF$

c.

$Cr^{3+}+4OH^-\rightleftharpoons Cr(OH_4)^-$

d.

$H_2SO_3\rightleftharpoons H^++HSO_3^-$

e.

$2NO+Br_2\rightleftharpoons 2NOBr$

Explanation:

The reaction quotient of an equilibrium reaction measures relative amounts of the products and the reactants present during the course of the reaction at  particular point in the time.

Q < Kc , reaction will proceed in forward direction.

Q > Kc , reaction will proceed in backward direction.

Q = Kc , reaction at equilibrium.

It is the ratio of the concentration of the products and the reactants each raised to their stoichiometric coefficients. The concentration of the liquid and the gaseous species does not change and thus is not written in the expression.

a. For the expression

$Q=\frac {[HCl]^2]}{[H2][Cl2]}$

The equilibrium reaction is:-

$H_2+Cl_2\rightleftharpoons 2HCl$

b. For the expression

$Q=\frac {[HF]}{[H^+][F^-]}$

The equilibrium reaction is:-

$H^++F^-\rightleftharpoons HF$

c. For the expression

$Q=\frac {[Cr(OH_4)^-]}{[Cr^{3+}][OH^-]^4}$

The equilibrium reaction is:-

$Cr^{3+}+4OH^-\rightleftharpoons Cr(OH_4)^-$

d. For the expression

$Q=\frac {[H^+][HSO_3^-]}{[H_2SO_3]}$

The equilibrium reaction is:-

$H_2SO_3\rightleftharpoons H^++HSO_3^-$

e. For the expression

$Q=\frac {[NOBr]^2}{[NO]^2 [Br_2]}$

The equilibrium reaction is:-

$2NO+Br_2\rightleftharpoons 2NOBr$