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Learn how to use the pH value of a solution to calculate the acid ionization constant (Ka) of a weak acid. Follow the steps to set up an ICE table, solve for the concentration of H3O+, and plug it into the equation for Ka.
The magnitude of the equilibrium constant for an ionization reaction can be used to determine the relative strengths of acids and bases. For example, the general equation for the ionization of a weak acid in water, where HA is the parent acid and A− is its conjugate base, is as follows:
Ka is the equilibrium constant of the dissociation reaction of an acid and is a measure of its strength. Learn how to calculate Ka from pH, use tables of Ka values, and distinguish between strong and weak acids.
Ka is the acid dissociation constant that measures the strength of an acid in solution. Learn how to calculate Ka, relate it to pKa and pH, and see examples and frequently asked questions on Ka chemistry.
Learn how to determine the acidity constant (Ka) or the basicity constant (Kb) of a weak acid or base from an experiment. See examples of how to use pH, ICE tables, and equilibrium concentrations to calculate Ka and Kb values.
The pH calculator can determine the pH from H⁺ molar concentration, or Ka, and the concentration of a solution.
Learn how to derive the dissociation constant (Ka) of an acid from its concentration and pH using the equation [H3O+] = 10 -pH. See an example of acetic acid and its Ka value.
The acid dissociation constant (Ka) is calculated using the equation Ka = [H+][A-]/[HA], where [H+] is the concentration of hydrogen ions, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the acid.
Learn how to calculate and interpret pH, pKa, Ka, pKb, and Kb, which describe how acidic or basic a solution is and predict the strength of acids and bases. A high pKa means a weak acid, while a low pKa means a strong acid.
This article shows simply the assumptions and the calculation methods for Ka, pH, [H+] and [HA] for weak acids.