(a) The single-point standard addition method was used in the determination of phosphate by the molybdenum blue method. A 10 mL urine specimen was treated with molybdenum blue reagent to produce species absorbing at 820 nm. Afterward, the sample was diluted to 10.0 mL. A 2.50 mL aliquot of this solution gave an absorbance of 0.428. Addition of 0.10 mL of a solution containing 0.0500 mg of phosphate to a second 2.50 mL aliquot of the sample gave an absorbance of 0.517. Calculate the concentration

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