Which statement regarding acids and bases is correct? A) Acids increase the pH, and bases decrease the pH. B) Acids increase the proportion of hydrogen ions (H⁺), and bases reduce the proportion of H⁺. C) Acids are harmful, but bases are not harmful. D) Acids combine with bases to form buffers. E) Acids combine with bases to form sugars.

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Acids increase the proportion of hydrogen ions (H+) in a solution, while bases reduce the proportion of hydrogen ions. This is reflected in the pH scale, where a pH of 0-6.9 is acidic, 7 is neutral, and 7.1-14 is basic or alkaline. Statement A is incorrect, as bases increase the pH and acids decrease it. Statement C is incorrect, as both acids and bases can be harmful depending on their concentration and the situation. Statement D is partially correct, as acids and bases can combine to form buffers, but this is not the only product that can be formed. Statement E is incorrect, as acids and bases do not combine to form sugars.

Which Statement Regarding Acids and Bases Is Correct