When taking into consideration a buffer, we must also look at buffer range. Here we're going to say that a buffer is effective as long as it has the right concentration ratio of weak species to its conjugate. Here for buffer range, where we have a ratio of weak acid to conjugate base, it is effective if that ratio is a 1250 ratio or a one to 10 ratio.
Basically at max, one of them can only be 10 times more than the other in terms of amount. If it goes beyond that range, it's no longer going to be an effective buffer. Here we're going to say a buffer is ideal or most effective when the concentration or amount of weak acid is equal to the amount of conjugate base.
Here we're going to say the larger the difference in concentrations between weak species and its conjugate, then the less effective a buffer will be. So again, you always want to play around with that 1250 ratio or one to 10 ratio when comparing your weak acid to its conjugate so to make sure that it will be as effective as possible.