Name these solutions typically containing a  weak acid or weak base that are used to maintain constant alkalinity, meaning they resist changes to  pH [P-H] levels.
One  type  of  these  solutions  developed  by  Prideaux  and  Ward  contained  phosphoric,   phenylacetic [FEE-nul-uh-SEE-tik], and boric acids, and a similar example of the universal  type of this solution was developed by Britton and Robinson.  One of these solutions, often   a saline [SAY-leen] with phosphate or acetate [AA-suh-tate], is used in high-performance liquid  chromatography. These solutions often use at least two solutes, and their impact can be predicted by  the Henderson–Hasselbalch [HAS-ul-bahlk] equation. Name these solutions typically containing a  weak acid or weak base that are used to maintain constant alkalinity, meaning they resist changes to  pH [P-H] levels.
One  type  of  these  solutions  developed  by  Prideaux  and  Ward  contained  phosphoric,   phenylacetic [FEE-nul-uh-SEE-tik], and boric acids, and a similar example of the universal  type of this solution was developed by Britton and Robinson.  
buffers [or buffering solutions or buffering agents]