Experiment # 6
Chris Antonette S. Gabriel
Kimberly R. Garcia
April Joy E. Gepana
De La Salle University- Dasmariñas
The experiment is about reviewing the stoichiometric calculations and become more familiar with various types of chemical reactions. In this experiment, we will use copper. The law of conservation of mass which means the total mass of all substances before a chemical reaction is the same after the reaction occurs. In the experiment, there would be five various reaction schemes that will be done. There would be oxidation, neutralization and precipitation, thermal decomposition, dissolution, and reduction. An important point of chemistry is that chemical reactions or changes involve the rearrangement of electronic structures of atoms. And applying the law of conservation of mass, this means that an element may go through several reactions transformed to its original state without any loss of mass.
This experiment aims to:
To practice common quantitative laboratory techniques such as methods of separation involving filtration, sedimentation, decantation and extraction and;
To understand stoichiometric calculations in determining the percentage recovery of copper. MATERIALS AND METHODS
The materials used in this experiment were 250 ml beakers, 10 ml and 100 ml graduated cylinders, boiling chips, wire gauze, Bunsen burner, evaporating dish, water bath, analytical balance, funnel, stirring rod and an iron ring and iron stand. A copper wire was cut into small pieces of about 10 cm in length. It was weighed using the analytical balance to the nearest 0.01 g. The copper wire was placed in a 250 ml beaker. A 4.0 ml of 16MHNO3 was added to the beaker under the fume hood and it was swirled occasionally. A special precaution was taken because concentrated nitric acid is very corrosive. After the copper wire has dissolved, distilled water was added until the...
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