Calculate $[H_3O^{+}]$ in $0.02 \ M$ solution of monobasic acid if dissociation constant is $1.8 \times 10^{-5}$.

  • A
    $3.0 \times 10^{-4} \ M$
  • B
    $6.0 \times 10^{-4} \ M$
  • C
    $2.0 \times 10^{-4} \ M$
  • D
    $4.0 \times 10^{-4} \ M$

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