This week we will also be handling titration. In this lab, titration will used to determine
the concentration of a compound. The process we will be using this week is the same as last
weeks. We will titrate the solution until we see the endpoint. he experimental point at which the
completion of the reaction is marked by some signal is called the end point (1). The endpoint is
usually indicated with a change of color. In this lab, there are two points in where this happens.
The second one is the try endpoint however. Titration is also very helpful when dealing with
issues in the food industry. Titration may also be used to determine the amount of a certain
chemical in food.
Often, titration is used to determine fat content, water content, and
concentrations of vitamins (2). Titration is also used to tell if cheeses and wines have aged
enough for distribution to supermarkets and shops (2). It is also useful in waste water analysis.
Titration is a key mechanism in this analysis. Often, more specialized titration equipment is used
in this application that can measure ammonia levels in combination with other reactants to
quantify other chemicals present (3). In this lab we will be using sodium thiosulfate solution to
titrate a known concentration of potassium iodate solution. The purpose of this lab is to
determine the concentration of the sodium thiosulfate solution based on the moles of potassium
iodate and the volume of sodium thiosulfate used.
(Reaction for this lab)
minimum 20 g of dried KIO3 (potassium iodate), minimum 120 g of KI (potassium