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Henderson–Hasselbalch Equation Using Acidity Constant

The Henderson–Hasselbalch equation describes the derivation of pH as a measure of acidity (using pKa, the negative log of the acid dissociation constant) in biological and chemical systems.

The pH equals the base 10 logarithm of the ratio between the base concentration and the acid concentration minus the base 10 logarithm of the acidity constant.

Formula

QuantityVariable["pH", "Unitless"] == Log[QuantityVariable["[B]", "Molarity"]/QuantityVariable["[HA]", "Molarity"]]/Log[10] - Log[QuantityVariable[Subscript["K", "a"], "Unitless"]]/Log[10]

symbol description physical quantity
pH pH "Unitless"
[B] base concentration "Molarity"
[HA] acid concentration "Molarity"
Ka acidity constant "Unitless"

Forms

Examples

Get the resource:

In[1]:=
ResourceObject["Henderson\[Dash]Hasselbalch Equation Using Acidity \ Constant"]
Out[1]=

Get the formula:

In[2]:=
FormulaData[ ResourceObject[ "Henderson\[Dash]Hasselbalch Equation Using Acidity Constant"]]
Out[2]=

Use some values:

In[3]:=
FormulaData[ ResourceObject[ "Henderson\[Dash]Hasselbalch Equation Using Acidity Constant"], \ {QuantityVariable["[B]","Molarity"] -> Quantity[0.25`, ("Moles")/("Liters")], QuantityVariable["pH","Unitless"] -> 3.38`}]
Out[3]=

Source Metadata

  • Creator:
  • Date: 1908

Publisher Information