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Empirical Formula Lab

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Here is a video that will describe the procedure for the Empirical Formula Lab. You need to read the procedure that was passed out in class in addition to watching this video.

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I'm recovering rodeo clown like it took today this grandma is going to involve the empirical start this with solid magnesium and hydrochloric acid when we combine them with your really cool reaction and we're going to keep Cactus liquid and get just magnesium chloride in yet the one thing we're going to know who this entire exploration is Max so it's very important you keep track in the next little bit I'm going to show you how to reaction after the ghost at the end we'll talk about the information you need in order to get the answer that we looking for actively doubt you are magnesium we're going to put it into a evaporating dish  inside of team ride because the real listen to take place when we add a little bit of 6 molar acid very cigarettes  Mexican siesta take too long they wanted to go to completion so we're going to let this sit for a few minutes when the reaction is done it should look like just a liquid and that liquid contains the that were interested in so you can see it's the clearest liquid so what we do is to put it on the hot plate and we turn the heat up we do not want it to boil so we don't turn it up all the we're going to put it short of around 5 or so and just monitor it our goal is to drive off all the excess liquid now what we're doing is repeating some not acid so that's the reason we don't want it to boil a nice steady heat that's going to drive off all the excess liquid and we should be in pretty good shape this will go on for a little while driving off liquid take some time Buster Keaton for a little while but all the liquid is gone or left at this white residue and that way is magnesium chloride that's were interested in but this is warm but not hot we need to do is need to take it off the hot plate depending on how hot it is you can do with your great if not use a pair of tongs we set it off to the side we're going to let it cool  but we got its mass were going to put it back on the hot and let it heat up again what's this is going to do with you can make sure that all of the liquid that could be on there is gone so we're really only interested in the mass after about 10 minutes we take it off the hot plate put it back down let it cool and we're going to get it to mass again think we started we started with the mass of an evaporating dish and some magnesium if the end we know the mass of the evaporating dish and segments somebody needs to the difference between those masses it going to tell us how much chlorine got in it Ticketmaster  on left can see the dead I took my dish by itself weighs 76 grams magnesium 0.15 Grand the dish once I had the Magnesium fluoride in it what's 76.57 G in after I heated it again it would 76156 it's easy for me to turn the grams of magnesium into moles it's simply / molecular mass of atomic mass go to figure out of chlorine well that's the difference between the amount of magnesium chloride made in the Magnesium that I started with the difference between those two messages amount of chlorine infant Master data tools 0.41 grams of chlorine divided by the atomic mass given to the 0.01 156 flooring  now I can take the ratio of those two since the moles of magnesium is smaller than chlorine I can see how many moles of turn I have per mole of magnesium and that comes out to 1.87 that means my formula would be mgcl 127 I'm going to call mgcl2  just running up that's a little lower than I would expect so I think that's something I'd probably have to talk about in my discussion I hope you enjoy the experiment as you can see it doesn't take very long but there are some steps that requires some feeding and waiting and heating wait so what we're going to do is forget it German Apple the entire class. It's actually we're going to go over empirical formula in that time so I think this is a really I look forward to seeing you in class

Uploaded by Nathaniel Pettinato.

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