# can anyone help with this.

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#1
I know that equilibrium constants are a ratio of the products to the reactants(in terms of their concentration) and we say when the system is at equilibrium the constant equals 1

this must mean the concentration of the reactants and products are equal for the system to be in equilibrium.

but I thought equilibrium ment a constant concentration due to the same rate in both directions not equal concentrations so why does the constant have to equal 1?
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1 year ago
#2
(Original post by utv)
we say when the system is at equilibrium the constant equals 1
This is not correct. That is where you are going wrong.
The range for Kc is roughly
Kc < 10^-10 = reaction does not happen (product concentration too low to be detected)
Kc > 10^10 = reaction goes to completion (reactant concentrations too low to be detected)

Kc from 1 to 10^-10 equilibrium lying to the left hand side.
Kc from 1 to 10^10 equilibrium lying to the right hand side.
Last edited by username1445490; 1 year ago
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#3
what is the value when at equilibrium then?
0
1 year ago
#4
(Original post by utv)
what is the value when at equilibrium then?
Somewhere between 10^-10 am 10^10
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