To analyze the vitamin C (C6H8O6, 176.12 g/mole) content in a tablet, two stepwise reactions were performed:

C6H8O6 + Br2 â C6H6O6 + 2 HBr

HBr + NaOH â NaBr + H2Oâ¨

One tablet with a mass of 2.00 g was dissolved in water and reacted with bromine. It was found that 53.20mL of 0.1350 M NaOH was required to completely react with all of the HBr produced from the Vitamin C. What is the approximate mass percentage of Vitamin C in the tablet?â¨

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Patrina SchowalterLv2

17 Dec 2019

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The vitamin C, (C₆H₈O₆) contentin a tablet is analyzed by a reaction with bromine and thentitration of the hydrobromic acid with standard base:

C₆H₈O₆ + Br₂ âC₆H₆O₆ + 2HBr

HBr + NaOH â NaBr + H₂O

One tablet was dissolved in water and reacted with bromine. Thesolution was then titrated with 53.20mL of 0.1350 M NaOH. How muchVitamin C did the tablet contain in mg?

	A.	449.2 mg
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	D.	323.7 mg
	E.	513.6 mg

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A weighed sample of iron (Fe) is added to liquid bromine (Br₂) and allowed to react completely. The reaction produces a single product which can be isolated and weighed. The experiment was repeated a number of times with different masses of iron but with the same mass of bromine (see graph below).

(a) What mass of Br₂ is used when the reaction consumes 2.0 g of Fe?

(b) What is the mole ratio of Br₂ to Fe in the reaction?

(d) Write the balanced chemical equation for the reaction of iron and bromine.

(e) What is the name of the reaction product?

(f) Which statement of statements best describe the experiments summarized by the graph?

(i) When 1.00 g of Fe is added to the Br₂, Fe is the limiting reagent.

(ii) When 3.50 g of Fe is added to the Br₂, there is an excess of Br₂.

(iii) When 2.50 g of Fe is added to the Br₂, both reactants are used up completely.

(iv) When 2.00 g of Fe is added to the Br₂, 10.8 g of product is formed. The percent yield must therefore be 20.0%

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A weighed sample of iron (Fe) is added to liquid bromine (Br₂) and allowed to react completely. The reaction produces a single product, which can be isolated and weighed. The experiment was repeated a number of times with different masses of iron but with the same mass of bromine (see graph below).