An acidic solution at 25°C hasGroup of answer choices[H3O+] > 1 × 10-7 M > [OH-].[H3O+] = [OH-] > 1 × 10-7 M.[H3O+] < 1 × 10-7 M > [OH-].[H3O+] > [OH-] > 1 × 10-7 M.
Question
An acidic solution at 25°C hasGroup of answer choices[H3O+] > 1 × 10-7 M > [OH-].[H3O+] = [OH-] > 1 × 10-7 M.[H3O+] < 1 × 10-7 M > [OH-].[H3O+] > [OH-] > 1 × 10-7 M.
Solution
The correct answer is [H3O+] > [OH-] > 1 × 10-7 M.
Here's why:
In an acidic solution, the concentration of hydronium ions [H3O+] is greater than the concentration of hydroxide ions [OH-]. This is because an acid donates protons (H+) to the solution, increasing the concentration of hydronium ions.
At 25°C, the product of the concentrations of hydronium and hydroxide ions is constant and equal to 1 × 10-14 M2 (this is known as the ion product of water). If [H3O+] is greater than 1 × 10-7 M (which is the concentration of each ion in neutral water at 25°C), then [OH-] must be less than 1 × 10-7 M to keep the product equal to 1 × 10-14 M2.
So, in an acidic solution at 25°C, [H3O+] is greater than [OH-], and both are greater than 1 × 10-7 M.
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