Reset your stopwatch, a repeat steps 9, 10 and 11 for the subsequent acids. Why does the amount of hydrogen produced per second decrease with time?? Since magnesium has only one valence and it reacts easily with HCl, it’s easy to generalize to other metals and acids. Temperature influences the rates of reaction through kinetic energy, such that high temperatures increase the kinetic energy of reacting molecules therefore causing frequent collisions, which form products faster. Make sure you put on your personal protective clothing and safety goggles. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.32 841.92] /Contents 4 0 R/Group<>/Tabs/S>> The magnesium looked like a gray powder. Reset your stopwatch timer and prepare a gas delivery system including water bath as shown figure one below. The experimental data show that using powdered Magnesium metal reduces the duration of reaction with HCl significantly. In acid-base chemical reactions, there are four main variables, which influence the rate of reaction. The change in pressure in a constant-volume (500-mL Erlenmeyer … These are the sources and citations used to research Magnesium and Hydrochloric Acid Experiment. Apparatus In this experiment you will determine the volume of the hydrogen gas which is produced when a sample of magnesium reacts with hydrochloric acid. Through this experiment, we have tested the process in which the time of reaction can be acquired through the undertaking of a chemical reaction, in this case, one between hydrochloric acid and magnesium. However, the experimentation had the following inconsistencies as shown the table below. Repeat step 5 and 6 for 2M, 1.5M, 1M, and 0.5M HCL and keep all the acids ready on the working bench. 3 0 obj Factors That Affect Reaction Rates - Chemwiki 2015. The time taken for the magnesium to totally dissolve in the hydrochloric acid was recorded by a stopwatch started as the magnesium ribbon was dropped into the hydrochloric acid inside the beaker. This single replacement reaction is a classic example of a metal reacting in an acid to release hydrogen gas. At higher acid concentration, the rates of bubble forming were rapid than those in lower acid concentrations were. Repeat step 16 with 2M, 1.5M, 1M, and 0.5M HCL and clearly label your results. The volume of the hydrogen gas produced will be measured at room temperature and pressure. 5 7980 • In two experiments, two equal masses of magnesium ribbon were allowed to react with two 50 cm3portions of dilute hydrochloric acid. To measure the effect of concentration on the average rate of a reaction. Wrap the magnesium pieces immediately in an aluminum foil to prevent them from being re-oxidized. magnesium (Mg) is known as a chemical element with the atomic number of 12. Magnesium will react with hydrochloric acid, because it is higher in the reactivity series than hydrogen. x��][o\9r~��p�7���;�f��س�� �@F��An˲6�e�ۙ������s�wˁ�`�&Y�*���x>>;k��y�D�T�5���עne�x���?W�v��峳�QTBV/�>;hS�J�ʵ���zyO �t�͖pV7��1��gg�����\���>W����x{���kd�߭�����^�볳?����}�m��!oB6u�=�*2� Secondly, why does the difference in temperature increase as the mass of magnesium increases? X Research source The chemical equation for this experiment is: Mg (s) + 2 HCl (aq) --> MgCl 2 (aq) + H 2 (g). He identified the gas as being hydrogen. The Reaction of Magnesium with Hydrochloric Acid. The data you obtain will enable you to answer the question: The formula is: Mg + 2HCl → MgCl2 + H2(g) - What is the mass in grams of two moles of HCl? 50 cm 3 of 1M hydrochloric acid is a six-fold excess of acid. Research questions: Barrans, R. E. (2012, March). Using this information, a small piece of metal magnesium is reacted with hydrochloric acid. • The gas produced was collected in a gas syringe (as shown opposite) so that its volume could be measured. Also what would happen if you had hydrochloric acid with a lower concentration? Though the room temperature was kept the same throughout the experiment other thing could have affected the temperature of the hydrochloric acid and the magnesium. Similarly, Gallagher & Ingram (2001) say that the depletion of H+ during the reaction of magnesium and HCl is factor that slows down the reaction as time goes on. The magnesium displaces the hydrogen in the acid, so it forms magnesium chloride and hydrogen gas. Experiment 5 Reaction of Magnesium with Hydrochloric Acid OUTCOMES After completing this experiment, the student should be able to: develop a procedure for generating and measuring a gas in a reaction. Magnesium is a light, shiny grey metallic element; symbol Mg, atomic number 12, found in-group two in the periodic table. Similarly, the duration of reaction will be determined using equivalent weights of powdered Magnesium metal. The time taken for the magnesium to totally dissolve in the hydrochloric acid was recorded by a stopwatch started as the magnesium ribbon was dropped into the hydrochloric acid inside the beaker. Magnesium and Hydrochloric Acid Introduction For chemical reactions involving gases, gas volume measurements provide a convenient means of determining stoichiometric relationships. 1�6��ԗ�EF\��ۚ�%|���`z��Z�J*R�J����d�I�;r�s����jO��t^W�t��v�WQ�fk� ƽ����n�D>���$%(��՘�����O���� �qL�!�Y���j�P��*MD[r����[=�C��r Q��c ���w��d��V7W�ڮy�E=�pwG+@ن2w�o�}v{J�ڴ�& In the zinc and hydrochloric acid experiment the learners collect gas in a balloon. The reaction from the magnesium ribbon and heated hydrochloric acid produced a large amount of hydrogen bubbles. The balanced formula for this is: Mg(s) + 2HCL(aq) MgCl2(aq) + H2(g) Magnesium + hydrochloric acid Magnesium Chloride + Hydrogen. Put one piece of magnesium into the beaker of hydrochloric acid, and time the reaction. Introduction In the experiment the magnesium reacts with the hydrochloric acid to create magnesium chloride and hydrogen. To determine the hypothesis, you would first find the time of reaction actually effected by the concentration of HCL solution. Therefore, this study intends to investigate the effect of concentration and surface area of reactants on the rate of chemical reactions. Stop the watch when all the magnesium disappears. Clark (2002) explains that, finely divided chemical solids have greater surface area than chemical solids in lumps. The experiment will be carried at a room temperature 25 0C. In-text: (Factors That Affect Reaction Rates - Chemwiki, 2015) THE EFFECT OF SURFACE AREA ON REACTION RATES. Retrieved March 8, 2012, from newton.dep.anl.gov: http://www.newton.dep.anl.gov/askasci/chem00/, Clark, J. Aim: To examine the reactivity of metals with dilute hydrochloric acid Materials: 5 test tubes, dilute hydrochloric acid, magnesium, zinc, iron, lead, copper Method. Although we had predicted and hypothesized that the duration of the reaction would be reduced by a half, the data partially supported the hypothesis since the data was 89.1% close to what we predicted. Therefore, we sought to test the duration of reaction of equal lengths Magnesium ribbons with reducing concentrations of hydrochloric acid. Place about 5cm depth of the acid in each of the five test tubes; Place a small piece of each of the three metals above. Therefore, we sought to test the duration of reaction of equal lengths Magnesium ribbons with reducing concentrations of hydrochloric acid. I am reacting different masses of Magnesium with hydrochloric acid to find the temperature change. Graph 1: Rate-reaction trends of magnesium metal ribbon and powder with increasing concentration of HCl, Calculations In this reaction, the magnesium and acid are gradually used up. Immediately cork the flask to the prepared gas delivery system. endobj Pick one piece of Magnesium ribbon drop in the first prepared acid in the conical flask and immediately start your stopwatch. Magnesium will react with hydrochloric acid, because it is higher in the reactivity series than hydrogen. It into magnesium and hydrochloric acid experiment acid as hydrogen gas produced will be measured at room temperature pressure. Is the reaction exothermic in the acid, because it is higher in the prepared..., so it forms magnesium chloride and hydrogen and safety goggles like 1., Barrans ( 2012 ) highlights that the reaction time ( s ) time 1 ( ). 3 of 1M hydrochloric acid produced a large amount of excess HCl is reacted with excess acid your stopwatch a! 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