If a solution of [M_o(NH_3)_6] Cl_3 has an absorbance of 1.21 when measured in a cell with a path lenght of 1.20 cm, what is it's concentration? The molar absorptivity at the wavelenght at which the measurement was obtained is 130 M^-1 cm^ -1
_# means that # is a subscript
^# means that # is a power
2007-10-13 11:12:28 · 1 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
If a solution of [Mo(NH_3)_6] Cl_3 has an absorbance of 1.21 when measured in a cell with a path lenght of 1.20 cm, what is it's concentration? The molar absorptivity at the wavelenght at which the measurement was obtained is 130 M^-1 cm^ -1
_# means that # is a subscript
^# means that # is a power
2007-10-13 11:13:38 · update #1
Well, absorbance, A, is defined as (molar absorptivity or extinction coefficient)*(concentration)*(path length). So now we have:
1.21 = (130 /M·cm)(concentration)(1.20 cm)
Therefore:
concentration = 1.21/(130*1.20) = 0.00776 (M)
2007-10-13 12:59:05 · answer #1 · answered by Hahaha 7 · 0⤊ 0⤋