Respuesta :

Answer:

pH of solution is 3.80

Explanation:

  • Formic acid an weak acid and formate is conjugate base of formic acid
  • Hence solution containing formic acid and formate acts as a buffer.
  • According to Henderson-Hasselbalch equation for a buffer consist of an weak acid (formic acid) and it's conjugate base (formate)-

[tex]pH=pK_{a}(formic acid)+log(\frac{C_{formate}}{C_{formic acid}})[/tex]

where, C stands for concentration

  • [tex]pK_{a}[/tex] of formic acid 3.75

So, [tex]pH=3.75+log(\frac{0.055}{0.049})=3.80[/tex]

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