How does a buffer resist change in ph upon addition of a strong acid? the strong acid reacts with the strong base in the buffer to form a salt, which produces few h+ ions in solution and therefore only a little change in ph. the strong acid reacts with the weak base in the buffer to form a weak acid, which produces few h+ ions in solution and therefore only a little change in ph. the strong acid reacts with the weak acid in the buffer to form a weak base, which produces few h+ ions in solution and therefore only a little change in ph.