Which statements about buffers are true? the principle behind a buffering solution is that the ph changes the least per added increment of acid or base at the p k a. a buffer solution is an aqueous solution of a weak acid and its conjugate base. the henderson-hasselbalch equation does not apply to buffering solutions. buffered solutions can minimize the change in ph, because the conjugate acid and conjugate base of the buffer are present in sufficient concentration to combine with and neutralize added h+ or oh–