Acidic solutions are represented on the pH scale by having pH values less than 7. The lower the pH value, the more acidic the solution is considered to be.
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The pH of a neutral solution is 7, and it is represented as pH 7 on the pH scale. A neutral solution has an equal concentration of hydrogen ions (H⁺) and hydroxide ions (OH⁻), resulting in a balanced pH value. On the pH scale, values below 7 indicate acidic solutions. The lower the pH, the stronger the acidity. For example, a pH of 6 is slightly acidic, and a pH of 1 is strongly acidic. Acidity increases as the pH value decreases, providing a logarithmic measure of hydrogen ion concentration and acid strength.