Adsorption of phenol from its aqueous solution on to fly ash obeys Freundlich isotherm. At a given temperature, from \( 10 \\ \mathrm{mg \, g^{-1}} \) and \( 16 \\ \mathrm{mg \, g^{-1}} \) aqueous phenol solutions, the concentrations of adsorbed phenol are measured to be \( 4 \\ \mathrm{mg \, g^{-1}} \) and \( 10 \\ \mathrm{mg \, g^{-1}} \), respectively. At this temperature, the concentration \(( \mathrm{in \, mg \, g^{-1}}) \) of adsorbed phenol from \( 20 \\ \mathrm{mg \, g^{-1}} \) aqueous solution of phenol will be __________.
Use: \( \log_{10} 2 = 0.3 \)
