pKa Using Acidity Constant
An acid dissociation constant is a quantitative measure of the strength of an acid in solution. pKa refers to the logarithm of the acid dissociation constant.
The log acidity constant equals the negative of the base 10 logarithm of the acidity constant.
Formula
![QuantityVariable[Subscript["pK", "a"], "Unitless"] == -(Log[QuantityVariable[Subscript["K", "a"], "Unitless"]]/Log[10])](https://www.wolframcloud.com/objects/resourcesystem/marketplacestorage/resources/0a1/0a1bc7ae-08ca-4944-9cd8-090f3360db54/Webpage/FormulaImage.png "Copy to Clipboard")
| symbol | description | physical quantity |
|---|---|---|
| pKa | log acidity constant | "Unitless" |
| Ka | acidity constant | "Unitless" |
Forms
Examples
Get the resource:
| In[1]:= | ![ResourceObject["pKa Using Acidity Constant"]](images/0a1/0a1bc7ae-08ca-4944-9cd8-090f3360db54-io-1-i.en.gif){kind=small} |
| Out[1]= |  |
Get the formula:
| In[2]:= | ![FormulaData[ResourceObject["pKa Using Acidity Constant"]]](images/0a1/0a1bc7ae-08ca-4944-9cd8-090f3360db54-io-2-i.en.gif){kind=small} |
| Out[2]= |  |
Use some values:
| In[3]:= | ![FormulaData[
ResourceObject["pKa Using Acidity Constant"], {QuantityVariable[
\!\(\*SubscriptBox[\("pK"\), \("a"\)]\),"Unitless"] -> 3.85`}]](images/0a1/0a1bc7ae-08ca-4944-9cd8-090f3360db54-io-3-i.en.gif){kind=small} |
| Out[3]= |  |