1. The problem statement, all variables and given/known data I need to know the concentration in ppm of a standard Fe2+ solution. (diluted) Here is the data I have. I have 0.1964 g of Fe solution the purity is 99.7% The original solution was the above # of g in 250ml water. 10ml of this was then pipetted into a 100ml volumetric flask and diluted. I have to find the concentration in ppm of this diluted solution using the info from the starting solution. 2. Relevant equations Don't think there are any. Just need logic to figure it out, of which I am limited in. 3. The attempt at a solution 196.4mg/0.250L =785.6 mg/L *(10ml/100ml) =78.56 ppm This is what I have, but I don't think it's right because 78.56 ppm is not in the range of the spectrometer we used. Also, I didn't use the 99.7% purity anywhere. Thanks.