Mariah Smith Patterson/ TR 7:00pm 10/5/2016 ANAL 618: Standardizing a Sodium Hydroxide Solution The purpose of this experiment is to determine the concentration of sodium hydroxide solution by titrating potassium hydrogen phthalate. A standard solution is one whose concentration we know. The concentration of a solution is express in molarity (M), the number of moles present in one liter of solution. Sodium hydroxide must be standardized and this can be done by titration. A titration is a method of analysis that allows you to determine the precise endpoint of a reaction and therefore the precise quantity of the reactant in the titration flask. A color change indicates the end point of a titration. In this experiment to determine when the reaction was complete we added an acid base indicator, a compound whose color depends on the acidity of the solution. The indicator we used was phenolphthalein, which is colorless in acid solutions and pink in solutions that contain an excess of a base. We also used potassium hydrogen phthalate which is an acid and sodium hydroxide which is a base. Sulfamic acid is also a primary standard acid like potassium hydrogen phthalate and could have been used instead. Sodium hydroxide is toxic and corrosive therefore it is important to wear googles, a lab coat, and gloves in this experiment. To perform this experiment you will need a buret, clamp, Erlenmeyer
You've reached the end of your free preview.
Want to read both pages?