buffered solution resists
changes in pH.
Buffers are used when tissues or organisms
are to be maintained at a precise pH, usually
between pH 7.2 and
7.4 for human and many
A phosphate buffer is one of the more common
buffers used and is made up of a precise
mixture of sodium monobasic phosphate (NaH2PO4)
and sodium dibasic phosphate (Na2HPO4).