Select the solution below that is the most acidic. A)[H₃O⁺] = 1.0 × 10^-4 M B)[H₃O⁺] = 1.0 × 10^-6 M C)[H₃O⁺] = 1.0 × 10^-7 M D)[H₃O⁺] = 1.0 × 10^-8 M E)[H₃O⁺] = 1.0 × 10^-10 M

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The acidity of a solution is determined by its hydrogen ion concentration ([H+]). The higher the concentration of hydrogen ions, the more acidic the solution is. A concentration of 1.0 × 10^-4 M (option A) is higher than the concentrations given in the other options, making it the most acidic solution.

Select the Solution Below That Is the Most Acidic