ANS:A - power of hydrogen ion concentration

The term pH stands for the "power of hydrogen ion concentration" in the solution. The pH scale is a logarithmic scale used to specify the acidity or basicity of an aqueous solution. It measures the concentration of hydrogen ions (H+) in the solution. pH is defined as the negative logarithm of the hydrogen ion concentration: pH=−log[H+] On the pH scale, values below 7 indicate acidic solutions, while values above 7 indicate basic solutions. A pH of 7 is considered neutral, indicating a balanced concentration of hydrogen ions and hydroxide ions (OH−) in the solution.