The diffusion limiting current $\left(\mathrm{I}_{\mathrm{d}}\right)$ at a dropping mercury electrode for an aqueous Mg (II) solution of concentration 'c' $\left(\mathrm{mol} \mathrm{L}^{-1}\right)$ is $300 \mu \mathrm{A}$. If 'c' is increased by $0.1 \mathrm{mol} \mathrm{L}^{-1}$, $\mathrm{I}_{\mathrm{d}}$ increases to $900 \mu \mathrm{A}$. The value of 'c' (in $\mathrm{mol} \mathrm{L}^{-1}$ ) is ____ (up to two decimal places)
Answer
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