Suitable means include, but are not limited to, {TAIL ~ the periodic addition} of base to {HEAD ~ the aqueous solution} or the use of buffers 
Suitable means include , but are not limited to , { TAIL ~ the periodic addition } of base to { HEAD ~ the aqueous solution } or the use of buffers
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH