The amount of ascorbic acid (vitamin C ; C6 H8 O6 ) in tablets is determined by reaction with br

step 1 So C6H806 man is determined by reacting bromine and then a titration. So this is illustrated in

The amount of ascorbic acid (vitamin C ; C6 H8 O6 ) in...

The amount of ascorbic acid (vitamin $\mathrm{C} ; \mathrm{C}_{6} \mathrm{H}_{8} \mathrm{O}_{6} )$ in tablets is determined by reaction with bromine and then titration of the hydrobromic acid with standard base: $$\mathrm{C}_{6} \mathrm{H}_{8} \mathrm{O}_{6}(a q)+\mathrm{Br}_{2}(a q) \longrightarrow \mathrm{C}_{6} \mathrm{H}_{6} \mathrm{O}_{6}(a q)+2 \mathrm{HBr}(a q)$$ $$\mathrm{HBr}(a q)+\mathrm{NaOH}(a q) \longrightarrow \operatorname{NaBr}(a q)+\mathrm{H}_{2} \mathrm{O}(l)$$ A certain tablet is advertised as containing 500 $\mathrm{mg}$ of vitamin $\mathrm{C}$ . One tablet was dissolved in water and reacted with Br. The solution was then titrated with 43.20 $\mathrm{mL}$ of 0.1350 $M$ $\mathrm{NaOH}$ . Did the tablet contain the advertised guantity of yitamin $\mathrm{C}$ ?

The amount of ascorbic acid (vitamin $\mathrm{C} ; \mathrm{C}_{6} \mathrm{H}_{8} \mathrm{O}_{6} )$ in tablets is determined by reaction with bromine and then titration of the hydrobromic acid with standard base:

$$\mathrm{C}_{6} \mathrm{H}_{8} \mathrm{O}_{6}(a q)+\mathrm{Br}_{2}(a q) \longrightarrow \mathrm{C}_{6} \mathrm{H}_{6} \mathrm{O}_{6}(a q)+2 \mathrm{HBr}(a q)$$
$$\mathrm{HBr}(a q)+\mathrm{NaOH}(a q) \longrightarrow \operatorname{NaBr}(a q)+\mathrm{H}_{2} \mathrm{O}(l)$$

A certain tablet is advertised as containing 500 $\mathrm{mg}$ of vitamin $\mathrm{C}$ . One tablet was dissolved in water and reacted with Br. The solution was then titrated with 43.20 $\mathrm{mL}$ of 0.1350 $M$ $\mathrm{NaOH}$ . Did the tablet contain the advertised guantity of yitamin $\mathrm{C}$ ?

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Key Concepts

Stoichiometry

Stoichiometry involves the quantitative relationships between reactants and products in a chemical reaction, based on the mole ratios provided by a balanced chemical equation. It is crucial for determining how the amounts of different chemicals participate and are converted in reactions, and for calculating theoretical yields.

Titration

Titration is an analytical technique used to determine the concentration of an unknown solution by gradually adding a reagent of known concentration until the reaction reaches its equivalence point. This method is fundamental in quantitative chemical analysis and is used to accurately measure substance amounts.

Molarity

Molarity is a measure of the concentration of a solution, defined as the number of moles of solute per liter of solution. It is an essential concept in solution chemistry, particularly useful in performing titrations and other quantitative analyses.

Mole Concept

The mole concept is a standard scientific unit that relates the mass of a substance to the number of particles it contains. It connects macroscopic measurements with the molecular scale, enabling conversions between mass, volume, and moles in chemical calculations.

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