Buffer Capacity Calculation

In Chemistry, Buffers are compounds that are used to resist changes in pH of a solution when the acids or bases are added. Buffer capacity is the measure of the efficiency of the buffers. It is expressed as the amount of strong acid or base, that must be added to 1 liter of the solution to change its pH by one unit. It is optimal when the ratio is 1:1; that is, when pH = pKa. Use this simple calculator for buffer capacity calculation of buffers.

Buffer Capacity Calculator

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β = ΔB / ΔpH Where, β = Buffer Capacity ΔB = Amount of Acid/Base ΔpH = Difference between initial and final value of pH


A buffer solution has an amount of acid with 0.02 mol, initial pH & final pH is 4.75 & 5.20. find β?


β = ΔB/ΔpH
= 0.02 / (5.20-4.75)
= 0.02 / 0.45
= 0.044 mol

The Buffer capacity (β) calculation is done by dividing the moles of an acid or base necessary to change 1 unit of pH of a solution by the pH change and the volume of buffer in liters.

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