Task: Text Categorization
Input (English): This quantity is measured along with volume on a Gran plot, and one device for measuring this quantity was developed by Arnold Orville Beckman. An analogue of this value is used to determine potential in an electrochemical cell in the Nernst equation, and a related value to this quantity, alkalinity, is derived from it and measures the concentration of hydroxide ions in a solution. For a high value of this quantity, phenolphthalein will turn pink, indicating the presence of a base, and it is calculated using the negative log of the concentration of hydrogen ions. For 10 points, name this chemical quantity that runs from values of 0 to 14, used to indicate acidity.
Output (English): Science