TitrantStandardization_000 - Titrant Standardization pH and...

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Titrant Standardization 65 pH and Buffer Capacity of Natural Waters Week 1: Titrant Standardization Full Report Objective – To standardize (determine the exact concentration of) a hydrochloric acid solution. Introduction The overall goal of the experiment is to measure the pH and buffer capacity of rain and environmental water samples. The buffer capacity refers to the ability of the water to resist changes in pH when an acid (such as HNO 3 or H 2 SO 4 from acid rain) is added. Specifically, it is the quantity of acid the buffer can accommodate without undergoing a significant pH change (more than 1 pH unit). The buffer capacity is a measured by titrating the water sample with a standard solution of hydrochloric acid. When carrying out titrations, it is important to know the exact concentration of the solution that is used in the buret – the titrant. Hydrochloric acid cannot be purchased in a highly pure form and therefore must be standardized to determine the exact concentration of the solution prepared. The process of standardizing hydrochloric acid involves determining its concentration by titrating with a basic primary standard which can be purchased in a very pure form, sodium carbonate (Na 2 CO 3 ). The chemical reaction between hydrochloric acid and sodium carbonate is given below. Notice that carbonate ion has the ability to accept 2 protons from the hydrochloric acid. 2 HCl + Na 2 CO 3 H 2 CO 3 + 2 NaCl CO 2 + 2 NaCl + H 2 O MW = 105.988
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Titrant Standardization 66 Safety and Waste Disposal Acids and bases are irritating and corrosive to skin and eyes. Wear eye protection and
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This note was uploaded on 07/02/2011 for the course CHEM-C 118 taught by Professor Flood during the Spring '10 term at Indiana.

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TitrantStandardization_000 - Titrant Standardization pH and...

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