Question

3.60 mL of "Unknown Solution" were pipetted into a 100 mL volumetric flask along with the molybdate and nitric acid solutions. This was diluted to volume, mixed and measured in the spectrometer.

The absorbance of this solution was 0.285
The concentration of this solution (from standard plot) was 0.0110 mM

Calculate:

e) Concentration of the unknown solution _______________ mM
f) Concentration of the unknown solution _______________ ppm P
g) Grams of "H3PO4" in 248 mL of unknown _______________ g