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CHEM101 Study Guide - Final Guide: Limiting Reagent, Equivalence Point, Reagent

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Yoram Apelblat
Study Guide

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Experiment F: Analysis of vitamin C in tablets and in
I) Objective:
1) Compare the content of vitamin C in tablets and orange drink
2) Identify limiting reactant
3) Di#erence between endpoint and equivalence point of a titration
II) Background:
1) Scurvy- common disease among sailors in the past due to lack of ascorbic
acid or vitamin C.
Vitamin C- soluble in water due to hydrogen bonds between (-OH) and (C=O) groups
and the (-OH) of the solvent molecules.
2) Stoichiometry and limiting reagent
Limiting reagent- substance which is totally consumed when the chemical reaction is
complete. The amount of product formed is limited by this reagent since the reaction cannot
proceed further without it.
Stoichiometric point- point at which the amounts of reactants are in stoichiometric
proportions (they are exactly in the correct mole ratio in such that neither reactants
remains after the reaction is done.
Stoichiometric factor- ratio of the reactants
When you have a solution of unknown concentration and a known concentration, we
can determine the value of unknown by gradually adding known concentration
using a BURET (titrate the unknown with Known as the titrant). Indicator is
commonly added to determine an endpoint that would coincide with the
equivalence point for the reaction.
3) Titrations in this experiment
3A) Titration with KIO3
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