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Determination of the Valency of Magnesium

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Introduction

Experiment 6 Title: Determination of the Valency of Magnesium Objectives: In this experiment, we can know about the quantitative relations between amounts of reactants and products of a reaction so that the stoichiometry reaction can be determined by a known mass of magnesium and a measured collection of hydrogen gas. Introduction: In chemistry, stoichiometry is the study of the combination of elements in chemical reactions. Stoichiometry refers to the relative number of atoms of various elements found in a chemical substance and is often useful in characterizing a chemical reaction. The related term stoichiometric is often used in thermodynamics to refer to the "perfect mixture" of a fuel and air.Stoichiometry is often used to balance chemical equations. ...read more.

Middle

A comparison of the amount of hydrogen produced with the amount of magnesium consumed will enable X value to be determined. Apparatus and Materials : * Magnesium ribbon * HCl(0.5M) * Burette (50cm3) * Pipette (25cm3) * Retort stand * Electrical Balance * Watch glass * Beaker(500cm3) * Gauze * Funnel * Rubber band * Glass rod * Thermometer * Barometer Procedures: 1. A burette is used upside down to collect the hydrogen gas, but there is an unmarked space between the 50cm3 mark and the tap of unknown volume. The space is determined in a clean, dry 50 cm3 burette by pipetting 25.00cm3 of water into the vertically clamped burette right way up. ...read more.

Conclusion

The burette was filled completely with 0.5M HCl, and invert it with fingers and place it in the water in the beaker. The finger was removed and place the end of the burette over the stem of the funnel, ensuring no air enters it and clamp it into position. 5. The excess of water was removed with a pipette until the level is just above the stem of the funnel. 6. About 100cm3 of 0.5M HCl is added to the beaker by using a glass stirring rod to ensure complete mixing such that the HCl reaches the magnesium. Some tapping with the glass rod on the watch glass was did to help to fasten the reaction. 7. The solution was stirred to initiate the reaction but not too further so that the reaction proceeds unaided. At the completion of the reaction, the watch glass is tapped gently to dislodge any gas bubbles. ...read more.

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