Get Charged Up Lab Report
Get Charged Up
Magnesium ribbon was reacted with Hydrochloric acid in three different experiments to determine the charge on a metal ion. After running multiple tests in the three different procedures, the Crystallization method proved to be the best method for determining the charge of the metal ion by using mole to mole ratio. Introduction
The objective of the Get Charged Up lab was to determine the charge on a metal ion reacting with HCl by determine the mole ratio in a reaction by determining the amount of excess reactant, amount of product, and amount of hydrogen gas produced as well as finding the best research method to determine the charge. To accomplish this, three different methods were used. Titration was used to react NaOH with HCl to determine the amount of H+ left over after the reaction is complete. Crystallization was used to determine the amount of MgCl₂ made after the reaction is done. Both of these methods allowed us to calculate the amount of H+ reacting with the amount of Mg. The gas law method and the Ideal Gas Law was also used to determine the mole ratio of magnesium metal to hydrochloric acid by measuring the amount of hydrogen gas based on the pressure and temperature changes during the reaction. With the results from each procedure, graphs were constructed and the most accurate and precise method was discernible. It is predicted that the titration method will be the most effect method of deterring a charge on a metal ion because almost all of the experiment done with titration is done by the experimenter and is the fairly easiest method. A titration is a method of analysis that will allow you to determine the precise endpoint of a reaction and therefore the precise quantity of reactant in the titration flask. Because of this precision, the titration method will be best for determining the charge of a metal ion because it is the most effective process. Method
Three different methods were used to determine which was the most accurate and precise method for determining the charge on a metal ion reacting with HCl. The first method used was the titration method. Titration is the determination of an amount of a substance by reacting the substance with a known amount of another substance. In this lab, NaOH was used to react with HCl to determine the amount of H+ left over after the reaction was complete. Magnesium ribbon was cut into six different masses and placed in six different beakers and allowed to react with 10.0 mL of HCl. An indicator was added to each beaker to determine when there is still H+ present in the solution. After the reaction was completed, each beaker was titrated with sodium hydroxide (NaOH) until an end point was reached (color change from the indicator). Using the mass of Mg, molar mass of Mg, moles of NaOH, and the end point volume, the moles of H+ reacting with Mg can be calculated. (The actual procedure can be found on pages 39-41 of the lab manual) The second method used to determine the mole ratio between Mg and HCl will be to produce the metal chloride as a solid so it can be weighed. This is called crystallization. Six different beakers were weighed and a piece of magnesium ribbon was cut to various masses (see page 42 of the lab manual) and placed into each beaker. Using a buret, 10.0 mL of HCl was added to each beaker to react along with an indicator (phenolphthalein) and each was allowed to go to completion. After completion, each beaker was placed on a hot plate and brought to a gentle boil. Solutions were boiled until the water and excess HCl had evaporated. The mass of each product (beaker and crystals) was recorded. At the end of the procedure, moles of Mg used in each trial was calculated along with the Moles of Cl in the salt for each trial. (The actual procedure can be found on pages 42-44 of the lab manual) The Gas Law method was the third method used to determine the amount of hydrogen...
References: Malina, Eric. 2013. General Chemistry Lab Manual.
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