Question

How do I calculate the Initial Fe(NO3)3 for each tria. Please help and show all work Please!!!!

1          2                      3          4          5

mL Fe(NO3)3                               1.0       2.0                   3.0       4.0       5.0

0.0003 M

mL KSCN 1.0 M 5       5 5 5       5

mL HNO3 0.1 M                           4       3 2 1       0

Total mL 10     10 10 10     10

Initial [Fe(NO3)3] 3.0x10^-5

Absorbance .284      1.085          1.325   1.820    2.121

Transmittance 52.01      8.22             4.73     1.51      0.76

Answer 1

Calculations

For Trial 1,

[Fe3+] initial = 0.0003 M x 1 ml/10 ml = 3 x 10^-5 M

[SCN-] initial = 1.0 M x 5 ml/10 ml = 0.5 M

[FeSCN2+] equilibrium = absorbance/molar absorptivity

For Trial 2,

[Fe3+] initial = 0.0003 M x 2 ml/10 ml = 6 x 10^-5 M

For Trial 3,

[Fe3+] initial = 0.0003 M x 3 ml/10 ml = 9 x 10^-5 M

For Trial 4,

[Fe3+] initial = 0.0003 M x 4 ml/10 ml = 12 x 10^-5 M

For Trial 5,

[Fe3+] initial = 0.0003 M x 5 ml/10 ml = 15 x 10^-5 M