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Preparation and Standardization of 0.010 M EDTA

  • Essay length: 1298 words
  • Submitted: 29/03/2009
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AS and A Level Inorganic Chemistry

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Lab #3

Preparation and Standardization of 0.010 M EDTA

Jacob Lockhart

Chem 212.02

Feb. 19th, 2009

Introduction

Preparing standard EDTA solutions using disodium dehydrate EDTA is a common practice in analytical chemistry. Since it is usually in a high state of purity, its solution needs to be standardized by titration against a primary standard. For this experiment the primary standard is a known concentration of high purity zinc solution because it allows a faster titration and portrays a very sharp end point. Since zinc hydroxide (7.1 x 10-18 solubility product) begins to precipitate around a pH of 7, eriochrome black T indicator must have an alkaline buffer for the titration and to inhibit zinc hydroxide from precipitating out of solution. To solve this, ammonium will be added to create the zinc tetraammine complex (4.2 x 108 solubility product) which will not precipitate at pH of 10. The goal of this experiment is to create solutions of EDTA and primary standard zinc and titrate zinc with the EDTA in an ammonia-ammonium chloride buffer at a pH of ten, using eriochrome black T as the indicator, to standardize the EDTA solution. At the endpoint, the

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