Experiment 4

Preparation and Standardization of Sodium Hydroxide Solution

一、Purpose and Requirement

This experiment is designed to introduce the students to the preparation and standardization ofsolutions with primary standard substance and it also illustrates the titration using a burette and thedeterminations of the end point of a titration.

二、Principle

Sodium hydroxide absorbs water and carbon dioxide in the air and it is customary to preparesodium hydroxide of approximately desired concentration and then standardize the solution against aprimary standard substance. Potassium biphthalate is most commonly used to standardize sodiumhydroxide solution for its readily available in purity of 99.95%，nonhygroscopic and it has a highequivalent weight，204.2 g/mol. The equation of this titration is a ......     （共3124字）    [阅读本文]>>