Acid base and redox titration of vitamin C - Lab Report Example

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This report seeks to determine the amount of vitamin C in a tablet. The experiment will apply the concept of molality and stoichiometry to determine the number of moles and mass of vitamin C. …
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Acid base and redox titration of vitamin C
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Download file to see previous pages 1:1 Moles of vitamin C 0.0031938mol Mass of vitamin C 0.564g Percent of vitamin C in the tablet 85.5% Table 2:The table below summarizes the results if the redox reaction experiment Data Trial Mass tablet used 0.67g Molarity of I3- (moles/L) 0.0990mol/l Initial volume of I3- (mL) 4.1 mL Final volume of I3- (mL) 28.6 mL Volume of I3- used 24.5 ml Moles of I3- used 0.0024mol Vitamin C: base molar ratio 1:1 Moles of vitamin C 0.0024mol Mass of vitamin C 0.43 g Percent of vitamin C in the tablet 64.18 % The equations used to find the answers in the trials are written bellow, Equation for table 1 C6H8O6(aq) + NaOH(aq) -> H2O(l) + Na+(aq) + C6H7O6-(aq) Equation for table 2 C6H8O6(aq) + I3-(aq) -> 3 I-(aq) +C6H6O6(aq) + 2H+(aq) Discussion/Conclusion:Chemical properties of substances initiate reactions. The reduction property of vitamin C, for example, is responsible for the chemical’s property to initiate reactions with other chemicals. The acid has a high tendency to donate electrons to other chemicals forming a basis for reactions. Based on stoichiometry and known information of a chemical in reaction with vitamin C, elements such as the number of moles and even mass of vitamin C can be determined from a reaction that can be either an acid base reaction or a redox reaction. The acid base reaction involved sodium hydroxide solution, the base in the reaction, and vitamin C, the acid. The equation for the reaction is given as follows C6H8O6(aq) + NaOH(aq) -> H2O(l) + Na+(aq) + C6H7O6-(aq) Vitamin C was oxidized in the process while sodium hydroxide was reduced. The redox reaction is on the other hand represented by the following equation, C6H8O6(aq) + I3-(aq) -> 3 I-(aq) +C6H6O6(aq) + 2H+(aq) The oxidation reaction is given by the following equation C6H8O6(aq)->C6H6O6(aq)+...
Chemical properties of substances initiate reactions. The reduction property of vitamin C, for example, is responsible for the chemical’s property to initiate reactions with other chemicals. The acid has a high tendency to donate electrons to other chemicals forming a basis for reactions. Based on stoichiometry and known information of a chemical in reaction with vitamin C, elements such as the number of moles and even mass of vitamin C can be determined from a reaction that can be either an acid base reaction or a redox reaction.
The acid base reaction involved sodium hydroxide solution, the base in the reaction, and vitamin C, the acid. The equation for the reaction is given as follows
C6H8O6(aq) + NaOH(aq) -> H2O(l) + Na+(aq) + C6H7O6-(aq)
Vitamin C was oxidized in the process while sodium hydroxide was reduced.
The redox reaction is on the other hand represented by the following equation,
C6H8O6(aq) + I3-(aq) -> 3 I-(aq) +C6H6O6(aq) + 2H+(aq)
The oxidation reaction is given by the following equation
C6H8O6(aq)->C6H6O6(aq)+ 2H+(aq)
The reduction equation is given by
I3-(aq) -> 3 I-(aq)
From the chemical equation, vitamin C is oxidized while iodine ions are reduced.
The accurate titration is the acid base reaction. This is because it offers the same percentage composition as indicated on the vitamin C tablet used.
The experiments offered different results.
While the redox reaction yielded a percentage composition of 64.19 percent, the acid base reaction yielded 85.5 percent. The difference in the numbers could be due to a number of errors. The first type of error that could have led to the difference is inaccurate measurement of the reactants. Such could occur in measuring readings in the titration process for the redox reactions. ...Download file to see next pagesRead More
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