3.89×10−7 mol L−13.89 \times 10^{-7} \mathrm{~mol} \mathrm{~L}^{-1}3.89×10−7 mol L−1
3.98×10−7 mol L−13.98 \times 10^{-7} \mathrm{~mol} \mathrm{~L}^{-1}3.98×10−7 mol L−1
3.98×10−8 mol L−13.98 \times 10^{-8} \mathrm{~mol} \mathrm{~L}^{-1}3.98×10−8 mol L−1
3.89×10−8 mol L−23.89 \times 10^{-8} \mathrm{~mol} \mathrm{~L}^{-2}3.89×10−8 mol L−2
