A solution with hydrogen ion concentration of 1x10^-7 is:

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Multiple Choice

A solution with hydrogen ion concentration of 1x10^-7 is:

Explanation:
The main idea is that acidity or basicity is determined by how many hydrogen ions are in the solution. A hydrogen ion concentration of 1 x 10^-7 M corresponds to a pH of 7, since pH = -log[H+]. At 25°C, pure water autodecomposes to equal amounts of H+ and OH−, each 1 x 10^-7 M, which makes the solution neutral. If [H+] were greater than 1 x 10^-7 M, the pH would be less than 7 (acidic); if it were smaller, the pH would be greater than 7 (basic/alkaline). So this solution is neutral.

The main idea is that acidity or basicity is determined by how many hydrogen ions are in the solution. A hydrogen ion concentration of 1 x 10^-7 M corresponds to a pH of 7, since pH = -log[H+]. At 25°C, pure water autodecomposes to equal amounts of H+ and OH−, each 1 x 10^-7 M, which makes the solution neutral. If [H+] were greater than 1 x 10^-7 M, the pH would be less than 7 (acidic); if it were smaller, the pH would be greater than 7 (basic/alkaline). So this solution is neutral.

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