The equilibrium expression (Kc) for the given reaction
H
2
O
⇌
H
+
+
O
H
−
H
2
O⇌H
+
+OH
−
is:
K
c
=
[
H
+
]
⋅
[
O
H
−
]
[
H
2
O
]
Kc=
[H
2
O]
[H
+
]⋅[OH
−
]
Where:
[H^+] represents the concentration of
H
+
H
+
ions,
[OH^-] represents the concentration of
O
H
−
OH
−
ions, and
[H_2O] represents the concentration of water.
However, because water is a solvent and its concentration remains approximately constant, it's often omitted from the equilibrium expression. So, the expression for Kc simplifies to:
K
c
=
[
H
+
]
⋅
[
O
H
−
]
Kc=[H
+
]⋅
