The H⁺ concentration in an aqueous solution at 25 °C is 5.5 × 10⁻⁶ M. What is [OH⁻]?
Question
The H⁺ concentration in an aqueous solution at 25 °C is 5.5 × 10⁻⁶ M. What is [OH⁻]?
Solution
To find the concentration of OH⁻ ions in the solution, we need to use the ion product of water (Kw) at 25 °C, which is 1.0 x 10⁻¹⁴.
The formula for Kw is [H⁺][OH⁻] = Kw.
We know the concentration of H⁺ ions is 5.5 x 10⁻⁶ M, so we can substitute this into the formula and solve for [OH⁻]:
[OH⁻] = Kw / [H⁺]
Substituting the known values:
[OH⁻] = (1.0 x 10⁻¹⁴) / (5.5 x 10⁻⁶)
Solving this gives:
[OH⁻] = 1.82 x 10⁻⁹ M
So, the concentration of OH⁻ ions in the solution is 1.82 x 10⁻⁹ M.
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