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.Step 1:
\The concentration of acetic acid HCH2H3O2 is 0.45 M.
\The concentration of sodium acetate NaC2H3O2 is 0.85 M.
\ka for acetic acid is .
Definition of pH:
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pH of the buffer solution is 5.0209.
\Solution:
\pH of the buffer solution is 5.0209.