The objective of this lab is to determine the concentration of a sodium hydroxide solution. This will be done by titrating the solution with a standard solution with a known concentration (KHP solution). 

Background: 

Titrations can be used to find the unknown quantity of a substance by reacting it with another. During a titration, one carefully adds a reactant until the reaction is complete (when it reaches the equivalence point). The equivalence point is when all of the substance being titrated has reacted. In some situations, an indicator is used to find this moment, but since it relies on spotting a change in color, it can be fairly inaccurate. In this lab we use an automatic titrator. This does the titration for us, and when connected to a computer and a pH sensor (on the GLX), it can find and record the equivalence point. 

In this lab, the pH levels shows how much sodium hydroxide was needed to react with the KHP, and the equivalence shows when they reached equilibrium.  

With this information, and the stoichiometric ratios of the reaction, one can find the information necessary to obtain the unknown concentration. To find concentration, the equation is c=n/v. Volume (v) is a recorded piece of data, and n (moles of the substance) can be found using stoichiometry.