Standardization of Sodium Hydroxide Solution

1520 Words Feb 2nd, 2013 7 Pages

This report is about how to standardize a Sodium Hydroxide (NaOH) solution by titrating it with pure sample of Potassium acid Phthalate (KHC8H4O4). This experiment has two sections. The first section is to standardize the Sodium Hydroxide by titration. Three sample of 0.7 – 0.9 g of solid KHP are place into each of the three numbered Erlenmeyer flasks. 50 ml of distilled water are added to each three of it from graduated cylinder and constantly shake it until the KHP solution are completely dissolve. 2 drops of phenolphthalein are add to each flask. Titrate each of the three flasks simultaneously with NaOH solution to the end point with the first appearance of a faint light pink that persist for 15 seconds. The colour will
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This benchmark is referred to as a standard. Sodium hydroxide (a base) is typically used as a standard to determine the concentration of acids. When an acid and base react, they form salt and water. acid + base → salt + water
In a titration the volume of a solution added to a reaction is measured using a buret. A buret is a long tube with a valve (stopcock) at one end at one end that can be used to control the flow. Burets are typically calibrated in milliliters.
The acid and base are reacted together until one of the two is completely reacted. That point is called the endpoint that is neutral. If any additional acid or base is added, the solution will then become acidic or basic depending on which was added in excess.
To visually determine the endpoint, an
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