labrep1

labrep1 - chemical reactions and conversions. It also...

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The goal in our chemistry lab was to formulate a couple different means to determine and verify the percent composition of a mixture given to us by our instructor. We then had to experiment with our methods, using several trials, to figure out the amounts of sodium bicarbonate (NaHCO3) and sodium chloride (NaCl) in the mixture. The mixture contained only these two substances. We weighed the initial samples to have a weight to look back at. Then what we did was measure out the correct mixture weights and added hydrochloric acid (HCl) to the concoction. When the chemicals mixed, HCl reacted with one of the two substances. After the reaction was complete, we reweighed what was left. Using the final weight, we used specific mass and percent composition equations to figure out what amounts of NaCl and NaHCO3 were in the mixture. The purpose of this lab was to familiarize students with means of finding composition of mixtures using
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Unformatted text preview: chemical reactions and conversions. It also helped us understand the chemical properties of substances in mixtures and use equations to balance of reagents and products. A mixture was weighed out to be _____________. The HCl was measured out to 12 mL. The mixture was set into a small beaker and the HCl was poured on top of it. The chemical reaction began to take place; the substances began to bubble and sputter, releasing a slight amount of carbon dioxide (CO2) into the air. When the fizzing concluded, we weighed what was left. Using the equations from earlier, we were able to discover the mass percent of the mixture and its components. Using equations like [HCl mass+mixture mass=initial mass] and [initial mass-final mass=CO2 mass] and [with mass of CO2, you can find mass of NaHCO3] and [with mass of NaHCO3, you can find the percentage of NaHCO3]...
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This note was uploaded on 02/20/2011 for the course CHEM 113 taught by Professor Johnson during the Spring '11 term at ASU.

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