Capacity
Buffer Buffer Capacity of a solution is defined as the number of moles of a strong acid or a strong base that causes 1.00 liter of the buffer to undergo a 1.00-unit change in pH. Mathematically, the buffer capacity is given by: Buffer capacity = = dcb/dpH = - where dca/dpH dcb is the number of moles per liter of strong base and dca is the number of moles per liter of strong acid added to the buffer. Since adding strong acid to a buffer causes the pH to decrease, dca/dpH is negative and buffer capacity is always positive.