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Multiple Choice

Which option is true about a neutral solution at pH 7?

The main idea is that pH reflects how many hydronium ions are in solution. A pH of 7 means these ions are present in equal amounts to hydroxide ions, so the solution is neither acidic nor basic. In water at room temperature, [H3O+] equals [OH−], each about 1×10−7 M, which gives pH 7 and a neutral solution. If the pH drops below 7, there are more hydronium ions, making it acidic; if the pH rises above 7, there are more hydroxide ions, making it basic. So at pH 7, the solution is neutral. (Temperature can shift the exact neutral pH slightly, but the concept of neutrality remains the same.)

The main idea is that pH reflects how many hydronium ions are in solution. A pH of 7 means these ions are present in equal amounts to hydroxide ions, so the solution is neither acidic nor basic. In water at room temperature, [H3O+] equals [OH−], each about 1×10−7 M, which gives pH 7 and a neutral solution. If the pH drops below 7, there are more hydronium ions, making it acidic; if the pH rises above 7, there are more hydroxide ions, making it basic. So at pH 7, the solution is neutral. (Temperature can shift the exact neutral pH slightly, but the concept of neutrality remains the same.)