[Cu2+] | Id |
0.0393 | 0.256 |
0.078 | 0.52 |
0.1585 | 1.058 |
0.489 | 3.06 |
0.99 | 6.37 |
1.97 | 13 |
3.83 | 25 |
8.43 | 55.8 |
Using this the excel plot was drawn as shown below
The given plot follows the equation y= 6.6157x-0.0858 where
y= Id
x= [Cu2+]
This equation can be used to determine the concentration of unknown solution with y=15.6 A
15.6 = 6.6157x - 0.0858
x = (15.6+0.0858) / 6.6157
x= 2.37mM
Thus the unknown solution have concentration of 2.37mM
3. The following polarographic diffusion currents were measured at -0.6 V for Cuso, in 2 M...
3. The following polarographic diffusion currents were measured at -0.6 V for CuSO4 in 2 M NH4Cl/NH3. Prepare an excel calibration plot and use it to estimate the molarity of an unknown solution giving Id = 15.6 μA. an unknown solution giving Id = 15.6 μA. Cu2+(mM) 0.0393 0.0780 0.1585 0.489 0.990 1.97 3.83 8.43 Id(uA) 0.256 0.520 10.58 3.06 6.37 13.00 25.0 55.8