The concentration of hydroxyl ion is 10^-9 M.
When an electrolyte is dissolved in water, it dissociates into ions.
In the above case, the ions are hydrogen (H+) and hydroxyl (OH-).
At a temperature of 298 K,
The ionic product(Kw of water is
Kw = [H+] [OH-] = 10^-14
Here [H+] = Concentration of hydrogen ions
[OH-] = Concentration of hydroxyl ions
Assuming that the above solution is at a temperature of 298 K, the ionic product(Kw) of water is
10^-14 = [10^-5] [OH-]
[OH-] = 10^-9.
Thus, the concentration of hydroxyl ions is 10^-9 M.
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