When $0.02 \ mol$ of $NaOH$ is added to $1 \ L$ of a buffer solution,its $pH$ changes from $5.75$ to $5.80$. What is the buffer capacity of the solution?

  • A
    $0.4$
  • B
    $0.05$
  • C
    $-0.05$
  • D
    $2.5$

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