Template:Acidity Data Section

These values are calculated based on the Ka and Kb values for acids and bases that are defined in the species database. It does not take buffering into account, and hence is, at best, an estimate of the pH.

SysCAD does have default Ka and Kb values defined for some acids and bases, and the user may enter values for other compounds. For a description of the method that SysCAD uses to calculate the acidity values see Acidity Calculations.

These values will only be shown if the user has chosen to display the pH_Estimate variables on the Plant Model - Views tab page or from the [[Material_{{{type}}}_Section#Qo_.28Qxxxx.29_Tab_Page|Include Properties]] dropdown list on the first page of the material {{{type}}} section. |- |font style="background: #ebebeb" colspan="3" | Acidity(@25C) |- |pH.State || font style="background: #ebebeb" |Calc || Either OK - only acids or bases present, OR Acid and Base present, therefore the calculations will be inaccurate. |- |pH.negLogH || font style="background: #ebebeb" |Calc || This is the negative of the log of the Hydrogen ion molar concentration at 25°C. |- |pH.AcidsPresent|| font style="background: #ebebeb" |List || This lists all of the acids present in the {{{UnitOp}}} that are used to calculate [H+] (molar concentration). |- |pH.BasesPresent|| font style="background: #ebebeb" |List || This lists all of the bases present in the {{{UnitOp}}} that are used to calculate [OH-] (molar concentration). |- |pH.H_Cation || font style="background: #ebebeb" |Calc || Only displayed if the species list includes H+(aq). This is the negative of the log of the Hydrogen ion molar concentration at 25 °C, due only to the presence of the H+(aq) ion (all other acids and bases are ignored).