242 ANAL0442: Analysing Food Products for Vitamin C Data Sheet 2 IL Analyzing a

Question

242 ANAL0442: Analysing Food Products for Vitamin C Data Sheet 2 IL Analyzing a Juice Sample identification of juice analyzed (brand, type) concentration of the DCP solution, mol L-1 (from Data Sheet 1) 0: OOS 2,6-dichloreindo Phenel DcP) volume of juice titrated, mL final buret reading, ml initial buret reading, ml. Ocah idolm volume of DCP solution required for titration, ml. number of moles of DCP required for titration, mol mass of ascorbic acid in juice sample, mg mass of ascorbic acid per milliliter of titrated juice, mg ml. mean mass of ascorbic acid in 1 mL. of juice, mg ml-1 mass of ascorbic acid in one 6-oz serving of titratesd juice, mg percent of RDA of ascorbic acid in one 6-oz serving of

Explanation / Answer

No of moles of DCP required for titration=volume*molarity

volume=final burette reading-initial BR

1)14.05*10^-3 L*0.008 mol/L=1.12*10^-4 moles

2)12.94 *10^-3*0.008 mol/L=1.03*10^-4 moles

3)14.08 *10^-3*0.008 mol/L=1.12*10^-4 moles

mass of ascorbic acid(vitamin C) in juice

vit Cred+ DCP (oxidized)----->vit C ox + DCP (red)

They react in 1:1 molar ratio so moles of DCP=moles of Ascorbic acid(Vit C)

1) mass of ascorbic acid =moles*molar mass=1.12*10^-4 moles*176.12 g/mol=0.0197 g=19.7mg

2) mass of ascorbic acid =moles*molar mass=1.03 *10^-4 moles*176.12 g/mol=0.0181g=18.1m g

3)mass of ascorbic acid =moles*molar mass=1.12*10^-4 moles*176.12 g/mol=0.0197 g=19.7mg

mass of acid per ml

1)19.7mg/15ml=1.31 mg/ml

2)18.1 mg/15 ml=1.21 mg/ml

3)19.7mg/15ml=1.31 mg/ml

mean mass of ascorbic in 1ml of juice=1.31+1.21+1.31/3=1.28 mg/ml

1 oz=29.6ml

6 oz=6*29.6 ml=177.6 ml

mass in 6 oz=177.6ml*1.28 mg/ml=227.39 mg

RDA or recommended dietary allowance per day=70mg

percent of RDA of ascorbic acid in one 227.39 mg/70mg*100=324.75 %

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