lab 3 write up - Carlos Caceres Acid Titration Experiment...

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Carlos Caceres Acid Titration Experiment Chem 1A Section 110 September 21, 2008 TITLE: Experiment 3- Using Titrations to Determine Concentration of HCl PURPOSE: The purpose of this experiment is to find the molarity of HCl to four decimal place by using titration techniques. Methods: All solutions were made by measuring .15-.25g of TRIS standard with a plate and an analytical balance. It was then added into a 250 mL Erlenmeyer flask. Distilled water was used to rinse the plate into the flask to make sure no TRIS standard was left unaccounted for. Diluted HCl was then added to neutralize said solution using a titration apparatus. 4-6 drops of Bromocresol green indicator were also added into the beaker, giving the solution a blue hue. Diluted HCl was added to a buret and was titrated into the beaker directly underneath it. To ensure an accurate and precise titration, calculations were made to show the theoretical amount of HCl that would be needed to neutralize the solution. This was done so less time was taken in adding the majority of HCl, being more careful as the amount calculated was nearing. This would ensure a proper change in color
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