More than the pKa, the pH exists. The information is provided as HCHO2 pKa = 3.74 and pH = 3.89 (HCHO2/NaCHO2). The strength of the acid increases with decreasing pKa value.
The pKa value describes the acidity of a molecule. The strength of an acid is determined by the proton's grip on a Bronsted acid. With falling pKa values, the acid becomes more potent and has a greater ability to donate protons.
The pH scale is expressed as the product of the pKa value and the log of the conjugate base concentration divided by the weak acid concentration.
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