Formula For pKa Calculator

  • Understanding the pKa Formula: The pKa formula used in the calculator is explained in detail. It involves taking the negative logarithm (base 10) of the ratio of the conjugate base concentration (A-) to the acid concentration (HA). This ratio represents the extent of dissociation of the acid, and the resulting pKa value is a measure of the solution’s acidity.


User Input

  • Prompting for Concentrations: The calculator begins by prompting the user to enter numerical values for the concentration of an acid (HA) and its conjugate base (A-).


  • Input Verification: Upon user submission, the JavaScript function calculatepKa() verifies the user’s input to ensure that valid numerical values have been entered.


  • Formula Application: If the input values are valid and the conjugate base concentration (A-) is not zero, the calculator proceeds to calculate the pKa value using a mathematical formula.

Display Result

  • Result Presentation: The calculated pKa value is then displayed on the web page in a designated div element with the id “result.” The result is formatted to show two decimal places for clarity.


  • Interpreting Results: The pKa value, once calculated, serves as an indicator of the solution’s acidity. A lower pKa value suggests a stronger acid, while a higher pKa value indicates a weaker acid.

This breakdown of headings provides a clear overview of how the pKa calculator works and how it utilizes the pKa formula to determine the acidity of a solution based on user-provided concentrations of an acid and its conjugate base.

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