For this kind of reaction to occur, an element that is more reactive has to displace one with less reactivity. Then calculate the mass of individually-measured lengths used in various steps of the experiment. The color of each solution is red, indicating acidic solutions. As the magnesium is used up, the rate falls. Read and record the temperature to the nearest 0. The rate of gas bubbles The independent variables Increasing concentration of hydrochloric acid: This will be changed by changing dilution factor. This is so that the reactant that is being oxidized will donate its electrons to the reactant being reduced.
If the oxidant has a reduction potential less than that of the reductant, that implies that its oxidation potential is greater than the reduction potential of the reductant, and there would be no reaction. During the experiment, one student can take the readings while the other records them. Level General and advanced chemistry This lab is designed to be done before any discussion of reaction rates occurs in class other than a very brief introduction on how to measure rates. These types of reactions will always produce a salt and hydrogen gas. It is helpful to carefully count the atoms prior to balancing. Measure and record the exact volume to the nearest 0.
This is because magnesium is higher than hydrogen in the reactivity series. Lastly, since the ideal gas law is not precise, error could have come from that. This weight was recorded to three significant figures. Hydrochloric acid is a corrosive liquid. A student worksheet is available to accompany this demonstration. I think that the results will go slower and… 1059 Words 5 Pages of temperature on the reaction rate of hydrochloric acid and magnesium.
Ensure that all naked flames are extinguished, and that there are no other sources of ignition available to students. Introduction: Chemistry happens everywhere, not just in a lab. As part of the assessment process, each student will be asked to evaluate the participation of group members. Allow about 5 minutes for this demo. For further reading and reference, list of sources can be found at the conclusion of each page. Surface area of Magnesium ribbon: This will be changed by using Magnesium ribbons and powdered Magnesium metal in separate experiments.
A small length of ribbon is cut and its length measured. For stance, magnesium metal reacts with hydrochloric to form magnesium chloride salt while displacing hydrogen from the acid as hydrogen gas. Sorry I'm just not understanding how initially the reaction begins. To balance this equation, you have to know the charges of the ions. We can express this as 2 half reactions, one showing the movement of electrons in the magnesium, and the other with the hydrochloric acid. The flammability of hydrogen gas can be demonstrated by carefully holding a match or fireplace lighter up to the popping hydrogen bubbles.
Screen capture done with Camtasia Studio 4. If when they collide and they do not have enough energy to break or form new bonds then they will simple bounce of each other, causing an unsuccessful collision. The constants controlled variables The quantity of Magnesium metal used will be held constant by way of using equal lengths of Magnesium ribbons and equivalent weights in grams of powdered Magnesium metal. The hydrochloric acid should be about 1M for a reasonable rate of reaction. The rate may be measured in several different ways. The most rapid gas bubbles were observed in the acid reactions with powdered Magnesium metal.
You will then identify two factors other than catalysis to alter the speed of this reaction and examine each factor quantitatively. The magnesium is added to the calorimeter, and a reaction takes place. As the temperature of the reaction increases, the rate increases. I felt that when performing the experiment, I could have gotten some error from my temperature readings. Illustration of a single displacement reaction.
Table 1 A table of study variables and operationalization of the study variables Prediction Given that, powdered Magnesium metal has a high surface area than equivalent lengths of Magnesium ribbon, we predict that the former will have shorter duration of reaction with hydrochloric acid than the latter. There is some acceleration of the reaction rate due to the rise in temperature. This is because the hydrogen ions H+ from the acid I have a large binding surface on magnesium metal but later, the surface area diminishes due to other factors in the reaction. . Students should not have access to any source of ignition.