Answer :
Amino acid and sodium hydroxide used to make a buffer solution.
What is buffer solution?
buffer solution is a waterproof solvent based solution in which consists of a mixture of containing a weak acid and the conjugate base of the weak acid, or a weak base of the solution and the conjugate acid of the weak base. They resist to a change in pH upon to the dilution or upon the addition of small amounts of a acid/alkali to them. Buffer solutions resist of a change in pH when smallest amounts of a stronger acid or a stronger base are added.
Sol-acitic acid is a weaker acid and its conjugate base is the acetate anion. That's why the addition of the strong base, hydroxide, which neutralized half of a acetic acid created a buffer and solution because we are having significant amounts of both acetic acid and its conjugate base, the acetate anion, in the solution.
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