which of the following pairs identify the two components that must be present to make a buffer?

All buffers contain a mixture of a conjugate acid–base pair; either a weak acid

(HA) and its conjugate base (A–), or a weak base (B), and its conjugate acid (BH+). Weak acids and

weak bases both dissociate slightly in water (Reactions 1 and 2).

Ka HA(aq) + H2O(l) —<—>— H3O+(aq) + A–(aq) Reaction 1

weak acid..............................................conjugate base

Kb B(aq) + H2O(l) —<—>— BH+(aq) + OH–(aq) Reaction 2

weak base.......................... conjugate acid

i think of you're looking too hard into this i could say C can't be A because of the fact it does not comprise plasma can't be B because of the fact water is a factor of plasma can't be D because of the fact does not comprise plasma the two can't be E because of the fact it does not comprise any cells different than platelets even although they are only fragments of cells, in case you count type platelets as cells then C may be the impressive answer