Experiment AN INSTRUMENTAL ANALYSIS OF POP FOR ITS PHOSPHORIC ACID CONTENT The P

Question

Experiment AN INSTRUMENTAL ANALYSIS OF POP FOR ITS PHOSPHORIC ACID CONTENT The Pre-Lab 1. A student performs an experiment for the determination of phosphoric acid (HyPO) present in a cola soft drink. A 0.5 milliliters sample of cola is diluted to 125 mL. The measured absorbance is 0.262. Using a graph of absorbance versus H PO concentration, the student determines that the diluted cola solution has a concentra- tion of 15.5 x 100 moles Niter: a) Calculate the total moles of H,PO present in 125 mL of solution with concentration 15.5 x 10 moles/liter. ume (in lihen) x concentration oin mole/lise moles of solute : b) How many moles of HyPO, are present in 0.5 mL of the undiluted cola. Only water is added in the dilution process. c) Calculate the concentration of HyPO, in moles/liter for the original cola solution. Recall: 0.5 milliliters 0.0005 Liters)

Explanation / Answer

a) moles of H3PO4 = 15.5*10-6 mol/L * (125/1000)L = 1.9375*10-6 mol
b) 125 mL has 1.9375*10-6 mol
0.5mL has ? mol
cross multiply to get the answer,
(0.5*1.9375*10-6) / 125 = 7.75*10-9 mol of H3PO4 are present in 0.5 mL
c) Concentration of H3PO4 for the original cola = (7.75*10-9)mol / (0.5/1000)L = 1.55*10-5M

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