1. The problem statement, all variables and given/known data Hi. A patient produced 1122 mL of urine in 24 hours. A 1.00-mL aliquot of the sample was treated with Mo(Vl) and ascorbic acid and was diluted to a volume of 50.00 mL. A calibration curve was pre- pared by treating 1.00-mL aliquots of phosphate standard solutions in the same manner as the urine sample. The absorbances of the standards and the urine sample were obtained at 650 nm, and then concentration of 1.00ml diluted aliquots of phosphate is found 2.5ppm. What mass in grams of phosphorus was eliminated per day by the patient? What is the concentration of phosphate in the urine (mmol/L)? 2. Relevant equations A = abC 3. The attempt at a solution Ok, what I really don't get is why in the first question they ask me for PHOSPHOROUS and in the second one for PHOSPHATE. And again, in the problem it says that this is a method used to determine PHOSPHOROUS, yet the standards are made of PHOSPHATE. It's really confusing to me... they shouldn't be the same thing, right?