PH
From SysCAD Documentation
Navigation: User Guide -> pH
Overview
The pH of a liquid solution is the negative log of the Hydrogen ion molar concentration in solution at 25 degrees C. This is often the basis for calculating the pH of a solution. However, since SysCAD does NOT include calculations for buffering, this is an estimate of the pH only.
SysCAD uses the standard equation for autoionisation of water at 25 degrees C:
pKw = 14 = pH + pOH
where:
pH = -log[H+]
pOH = -log[OH-]
Implementation in SysCAD
- Entering pH Data in the Species Properties Database - A description of the Acid and Base Dissociation constants that can be entered or changed in the Species Properties Database.
- Displaying pH in a Project - The pH estimate can be displayed throughout a project by enabling the pH_Estimate tick box on the Species page in Plant Model (View - Plant Model - Species Tab).
- Estimate of pH in Units and Pipes - This describes the information shown in the access window of pipes, tanks, etc.
- Acid and Base Dissociation constants used in a Project - The Acid and Base Dissociation constants entered a project can be seen in the Species Properties Access Window (View - Species Data).
- Acidity Calculations - This describes the methodology used to estimate the pH.
- Standard Acid and Base Dissociation constants in SysCAD - This gives a list of the Dissociation constants for a number of Acids and Bases in SysCAD.
