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Question

What is Q in equilibrium

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Solution

The detailed explanation is as follows.

The expression for the reaction quotient, Q, looks like that used to calculate an equilibrium constant but Q can be calculated for any set of conditions, not just for equilibrium.

Q can be used to determine which direction a reaction will shift to reach equilibrium. If K > Q, a reaction will proceed forward, converting reactants into products. If K < Q, the reaction will proceed in the reverse direction, converting products into reactants. If Q = K then the system is already at equilibrium.

In order to determine Q we need to know:

  • the equation for the reaction, including the physical states,
  • the quantities of each species (molarities and/or pressures), all measured at the same moment in time.
To calculate Q:
  • Write the expression for the reaction quotient.
  • Find the molar concentrations or partial pressures of each species involved.
  • Subsitute values into the expression and solve.
Hope it answers your question.
All the best!

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