This study source was downloaded by 100000795075979 from CourseHero com on 04 24 2023 01 57 47 GMT 05 00 https www coursehero com file 43767432 experiment 9 lab report pdf Analysis of a Two Component Alloy Jayden Mattson Chemistry 141 1193 Jessica Stanfield July 2 2019 This study source was downloaded by 100000795075979 from CourseHero com on 04 24 2023 01 57 47 GMT 05 00 https www coursehero com file 43767432 experiment 9 lab report pdf Objective The purpose of this experiment was to use a two metal alloy sample to determine the amount of hydrogen gas it was able to give off In order to see the amount of hydrogen given off we will be looking at the volumes temperature total pressure amounts and using the ideal gas law By taking the heights of the water displaced by the reaction it will allow us to see the pressure changes in the chambers which ultimately allows us to form a system of equations to further calculate Immediately after putting the metal alloy into the acid it will be imperative to completely seal off the flask because the hydrogen gas immediately starts being produced In order to get accurate results we will be doing this experiment in 3 trials which will then allow us to find the percentages of Zinc and Aluminum are in the metal samples Another thing we will be obtaining from this experiment is going to be the standard deviation and averages of these amounts which will allow us to discuss information statistical analysis Introduction Before doing this experiment it was important that we understood what an alloy was An alloy can be described as two different chemical elements coming together to make a mixture one always being a metal A large majority of all metals used in todays day are actually alloys because they have properties that make them better than just the chemical elements One of those properties is the ability to not corrode and also have both magnetic and electric properties we don t often see otherwise Another thing that is great about alloys is they generally cost less than the pure elements One common example we see of alloys is 18k gold which is just a fraction of the real gold combined with nickel zinc or copper but yet it still has the same color property This study source was downloaded by 100000795075979 from CourseHero com on 04 24 2023 01 57 47 GMT 05 00 https www coursehero com file 43767432 experiment 9 lab report pdf and is even stronger than real gold In our case for the experiment both elements are metals Zinc and Aluminum For the chemical equations of this experiment we will be reacting the metals with hydrochloric acid which produces the a chloride compound and excess gas These equations will need to be correctly balanced in order that the percentages of the metals can be found for each of them The equations are as follows Zn s 2HCl aq ZnCl aq 3H2 g 2Al s 6HCl aq 2AlCl aq H2 g The whole experiment revolves around gas laws in a number of ways Once all of the numbers are retrieved we will be able to use the ideal gas law which is PV nRT which is then manipulated too be n PV RT Before using this law we have to use Dalton s law to find the partial pressures of the atmospheres water displaced and the height differences in the water known as enthalpy The partial pressure law is as follows Ptotal Pgas 1 Pgas 2 Pgas 3 The final calculations of this experiment will be done by establishing a two part system equation One variable plus another variable equaling the amount of alloy weights from each sample The other part of the system will involve using the masses of zinc and aluminum while multiplying the variables by each and using the process of substitution to find the percentages of the elements found The percentage found will be subtracted from 100 and that will yield the other element This study source was downloaded by 100000795075979 from CourseHero com on 04 24 2023 01 57 47 GMT 05 00 https www coursehero com file 43767432 experiment 9 lab report pdf percentage It will be important to find the standard deviations and averages of the elements found in the compound Procedures The procedures follow that which was written out in Lehman J Olmstead T et al 2002 Experiment 1 Calibration of Glassware Density and Error Analysis In Grossmont College Chemistry 141 Laboratory Manual 7th Edition pp 9 14 El Cajon California There was no additions to the lab manual procedures besides simply adding one more trial to the testing More trials may have been necessary if the ratio of the mL of hydrogen gas produced to the grams of alloy used in each trial greatly different from each other Calculations and Results Below is a data table which sums up all measurements taking during the course of the experiment in class Alloy Data This study source was downloaded by 100000795075979 from CourseHero com on 04 24 2023 01 57 47 GMT 05 00 https www coursehero com file 43767432 experiment 9 lab report pdf Below is the written calculations for trial 2 of finding the percentages of zinc and aluminum The partial pressures are found as well as the number of moles and then the two system equation is used to find the percentages Trial 2 Percentages of Each Component Averages and Standard Deviation This study source was downloaded by 100000795075979 from CourseHero com on 04 24 2023 01 57 47 GMT 05 00 https www coursehero com file 43767432 experiment 9 lab report pdf Discussion Overall the experiment seemed to go well considering I didn t have to repeat trials because they yielded close results when I checked it In all trials there was immediate fizzing yet it seemed to decrease in intensity as the trials progressed on The solution turned dark gray black with each addition of the alloy and got more intense in color as the trials went on The flask continues to feel warm to the touch as the trials persist and a points the coloring lessens and turns a brownish color before adding another piece of the alloy The pieces we were adding we grey and black lightweight pieces of Zinc and Aluminum These are endothermic reactions due to the positive differences in bottle height values Although I only did 3 trials I think I am still able to say these are reliable results considering the percentages all went hand in hand The average of the zinc was 61 16 and the aluminum average was 45 66 When comparing these to the given percentage of zinc which was 58 67 it shows that I was only 2 49 off of the measurement which directly corresponds to my stand deviation being 2 05 for the zinc The lower