Spinach juice is not but an acid may contain some acids (eg. oxalic acid), more than base.
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In a Brønsted-Lowry acid-base reaction, an acid donates a proton (H+) to a base, which accepts the proton. This results in the formation of a conjugate base from the acid and a conjugate acid from the base. The overall reaction involves the transfer of a proton from the acid to the base.
it is a base
base
it is a base.
In order to have an effective buffer, one needs to have a weak acid or a weak base, and the salt (conjugate) of that weak acid or weak base. Examples would be :weak acid/conjugate base: acetic acid/sodium acetateweak base/conjugate acid: ammonia/ammonium chloride