Answer is true.
A buffer solution is composed of a mixture of a weak acid its conjugate base. Buffer solution resists changes in pH upon the addition of a small amount of strong acid or strong base. As long as the amount of strong acid or base added is small compared to the amount of conjugate acid and conjugate base in the buffer, its pH does not change. If too much strong acid or base, is added then the buffer capacity is then exceed. Buffer capacity refers to the amount of added acid or added base that can be neutralized by a buffer. It is determined by the concentrations of the conjugate acid and conjugate base. Buffer capacity increases upon increase in concentrations.