Hello,
I have a couple of questions regarding Beer's Law.
1) In order to prevent hydrolysis reaction of Fe2+ solution with water, acid must be added to the standard iron
solution. Student forgot to add acid to the standard solution. What change this will have on student final
results?
I think because the acid was not added then the less iron(II) ions present in the sample so more light will be transmitted through.
2). If 2.5 mL of a standard iron solution (1 mL = 0.050 mg Fe) is diluted to 100 mL, what is the final iron
concentration in mg Fe/mL?
Unsure of what the question is asking :(
4. A solution concentration 3.75 mg/ml of a sample 220 g/mol has a transmittance of 39.6% in a 1.50-cm cell at
480 nm. Calculate the molar absorptivity of sample.
I know I use Beers Law:
A=abc
solve for a = A/bc
I know A is equal to -log (39.6)
b, I am unsure of but I think it is 1.50 cm, I am confused on the wavelength value of 480nm.
c, I think should be 3.75 mg/ml, but what us the 220 g/mol for?
Thanks for any help
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