Since the product of your reaction should be pure magnesium oxide (containing magnesium and oxygen), and the initial material taken was pure elemental magnesium, the mass of oxygen reacted should just be the difference in these two masses. For the data listed above, calculate the mass of the product, then click here to check your answer. The mass of product to be used in all subsequent calculations is based on the final mass of the crucible/beaker and contents (after all heatings have been completed) minus the mass of the empty container (before the magnesium was put into it). Note that all masses should be determined to four decimal places on the electronic balance: this results in typically 6 significant figures when the masses of containers are included, which provides for the masses of magnesium and magnesium oxide to be determined to four significant figures. The masses recorded on in Section I, part (c) include the mass of the containers (the mass of the empty containers is recorded in Section I, part (b)). Your answer should be between 0.3 and 0.4 g (if you have a larger number than this, you are including the mass of the beaker). The mass of magnesium recorded for, Section I, part (a) should be only the mass of the magnesium metal itself (not including the mass of the beaker in which the mass determination was made). Note that the experiment calls for you to determine in a small beaker the initial mass of magnesium metal taken. Suppose the data below were recorded for this experiment (see, Section I). From these two masses, you calculate the percentage composition of magnesium oxide. Mg + O2 ® magnesium oxideĪfter the magnesium sample has reacted completely, you determine the mass of magnesium oxide product. Magnesium metal reacts with the oxygen (O2) of the air to form magnesium oxide. When the crucible is cool to touch, weigh the crucible and lid on the digital balance.In this experiment, you precisely weigh a sample of magnesium metal, and then heat the sample in the air. DO NOT put a hot crucible on the lab bench. Leave the crucible resting on the clay triangle. Turn off the burner and allow the crucible to cool. This will ensure that the crucible is clean and dry. Heat a clean and dry porcelain crucible with lid (on a clay triangle supported on a ring stand) directly over a Bunsen burner flame for about 5 minutes. The solid product from the reaction can be disposed into the regular garbage can in the lab. Let crucibles cool prior to adding water. Set hot crucibles on to wire screens to cool.Ī hot crucible will break if splashed with water directly. Use of eye protection is required for all experimental procedures.Ī hot crucible will break if placed directly on a cold surface. Section 2: Safety Precautions and Waste Disposalĭo not look directly at the burning magnesium ribbon. The flame is bright enough to damage your eye. Students will learn how to convert mass to mole of a given sample and determine empirical formula of a substance from mass and mole data. Students will determine the mass of magnesium sample before and after the reaction, and the mass of magnesium and oxygen in the product. In this experiment, students will conduct the reaction between magnesium and oxygen gas. \)ĭetermine the empirical formula of magnesium oxide.Ĭalculate the mass of oxygen using weighing-by-difference.Ĭalculate the mole of a sample from its mass.
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