Water ionizes to a very small degree into hydronium ions, H3O+, and hydroxide io
ID: 706618 • Letter: W
Question
Water ionizes to a very small degree into hydronium ions, H3O+, and hydroxide ions, OH?:
The very small value of the equilibrium constant, Kw, should give you an appreciation for how few water molecules actually ionize in pure water.
In neutral solutions, [H3O+]=[OH?].
In basic solutions, [H3O+]<[OH?].
In acidic solutions, [H3O+]>[OH?].
But in all aqueous solutions, the product of the hydronium and hydroxide concentrations is equal to Kw. Thus, Kw allows you to calculate [H3O+]from [OH?], or vice versa.
Part A)
5.00×10?3 mol of HBr are dissolved in water to make 12.0 L of solution. What is the concentration of hydroxide ions, [OH?], in this solution?
Express your answer with the appropriate units.
2H2O(l)?H3O+(aq)+OH?(aq) Kw=[H3O+][OH?]=1.00×10?14Explanation / Answer
HBr + H2O = H3O+ + Br-
Molarity of [HBr] = [H3O+] = moles / volume
= 5.00*10^-3 / 12
= 4.17*10^-4 M
(H3O+)*(OH-) = 1.00*10^-14
= ( 4.17*10^-4)*(OH-) = 1.00*10^-14
= OH- = 2.398*10^-11 M
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