Question

How will each of the following changes affect an equilibrium mixture of reactants and products? Answer...

How will each of the following changes affect an equilibrium mixture of reactants and products? Answer with increase, decrease, to the left, to the right

Fe^3+ + HSCN = Fe(SCN)^2+ + H^+

Shift direction

[Fe^3+]

[HSCN]

[Fe(SCN)^2+]

[H^+]

Add Fe^3+

Add HSCN

Ass HNO3

Changes in concentration do no change the value of Keq as long as the temperature remains constant. Please explain.

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Homework Answers

Answer #1

1. On adding Fe3+, equilibrium will shift to the right. [Fe3+] will increase, [HSCN] will decrease, [Fe(SCN)2+] and [H+] will increase.

2. On adding HSCN, equilibrium will shift to the right. [Fe3+] will decrease, [HSCN] will increase, [Fe(SCN)2+] and [H+] will increase.

3. HNO3 ionises to give H+ and (NO3)- and its effect is governed by common ion effect. Since [H+] appears on right hand side of the equation, therefore on adding HNO3 equilibrium will shift to the left. [Fe3+] will increase, [HSCN] will increase, [Fe(SCN)2+] will decrease and [H+] will increase.

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