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ChemLab113-0018 - BLOCK I QUANTITATIVE VOLUMETRICANAL YSIS...

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Unformatted text preview: BLOCK I QUANTITATIVE VOLUMETRICANAL YSIS Experiment 1: Laboratory Techniques and Determination of Density Experiment 2: Measurement of Acid Malaria! Experiment 3: Analysis afSoda Ash Unknown INTRODUCTION Quantitative chemical analysis is probably the best type of measurement to acquaint you with quantitative chemical measurements. You will analyze a sample containing sodium carbonate (Na2C03). Sodium carbonate is a chemical widely used in industry, where it is called soda ash. For example, it is one of the principal ingredients in glass. Your goal is to measure the percent by mass of sodium carbonate in a sample containing an unknown amount of sodium carbonate. Each student will be given a sample with a different mass percent. A significant part of your score for this lab depends on the accuracy with which you measure your sodium carbonate mass percent. The actual analysis of your soda ash unknown is the third experiment in Block 1. Before that experiment can be carried out, other experiments in preparation for it must be performed. In analyzing the soda ash sample, you Will use the fact that sodium carbonate is a base, while the other ingredients in the sample are neither acids nor bases. Consequently, you can analyze for sodium carbonate in the sample by reacting it with a known amount of an acid solution of known concentration. The first experiment will let you learn some necessary basic skills. The second experiment involves the preparation of the acid solution and the measurement of its concentration. 27 ...
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