Investigating the Relative Atomic Mass of Lithium
Background information
I’m going to produce a piece of coursework, which determine the relative atomic mass of lithium.
Two methods are going to be used to approximate the relative atomic mass of lithium.
1) In the first method the RAM (Relative atomic mass) of lithium is determined by the Volume of hydrogen gas produced.
2) In the second method the RAM of lithium is determined by titrating the lithium hydroxide produced.
To some extend, I think that the first method is the most practical and less complicated, because the less calculations has to be done. Hence it is more easer to measure the volume of hydrogen gas.
Test-1
My mission was to find
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This is not what I was expecting, because in the real sense of things the second method should be more accurate. This is due to the more precise equipment that was used in the second method, e.g. pipette, burette. This unexpected outcome could be explained in terms of experimental error. ======================================================================
I noticed that in the first method the experimental error was lower than that of the second method; this suggests that second method is more inaccurate than first one in my experiment. Therefore we had an unexpected outcome. ====================================================================
Evaluation:
Half fill the ... ... middle of paper ... ... e data quality. Furthermore, using a graduated cylinder with markings below the 100 mL line would have allowed for more accurate measurements of the initial volume of air in the graduated cylinder.
Switch to a solution of 1 part water to 1 part ammonia or 1 part water to 1 part hydrogen peroxide....
To start with, the first separation technique we performed on the heterogeneous mixture was filtration. According to our observations of the residue, we believed graphite was one of the substances in the mixture. Graphite, a known ingredient used in pencils, is black or dark grey in color, like the dark spots on the filter paper (Figure 1B), and has the ability to leave marks on paper and other objects. Of the potential components given to us, only graphite possessed the ability to make a mark on other surfaces. This was supported by the smudges left behind on our finger and filter paper (Figure 1A, bottom filter paper) when we touched the residue.
In the second experiment with the green color, I can safely conclude that the color green in this case is very soluble and we would need longer filter paper, perhaps more time to safely separate the different colors that make up the color green.
...o do this, pull out the dipstick, wipe it clean on a rag, and reinsert it. Remove the dipstick again and check that the oil level reaches correct marking (full). If not put more oil in until the oil level is correct.
...for the original titration, shown in Table 5. This could be due to perhaps usage of the wrong indicator, or of not stopping the titration exactly when the color changed.
7. Using the stirring wire, stir the mixture until the solute completely dissolves. Turn the heat source off, and allow the solution to cool.
Determining the Relative Atomic Mass of Lithium An experiment has been carried out to determine the relative atomic mass of Lithium by using two different types of methods The first method that was carried out was to determine the volume of Hydrogen produced. In this experiment a fixed amount of Lithium was used, in my case it was 0.11g. At the end of this experiment, the volume of Hydrogen gas I collected was 185cm³. Then using the solution of lithium hydroxide made from experiment one, I used it in the titrating experiment, to find out the total volume of Hydrochloric acid used to titrate the lithium hydroxide. RESULTS TABLE Experiment Initial Volume ( cm³) Final Volume ( cm³) Total volume Of HCl used ( cm³) Rough 0.2 30.3 30.1 1 6.3 35.8 29.5 2 2.7 32.0 29.3 Average 29.6 CONCLUSION Method 1 [IMAGE]2Li (s) + 2H20(l) LiOH(aq) + H2(g) Number of moles of Hydrogen. Volume of hydrogen gas was 185 cm³. Weight of Lithium was 0.11g. N = __V__ _185_ = 0.0077 MOLES 24000 24000 Number of moles of Lithium.
sent to find how far the Germans had come in the building of the atomic
One of the best methods for determining mass in chemistry is gravimetric analysis (Lab Handout). It is essentially using the the mass of the product to figure out the original mass that we are looking for. Thus the purpose of our experiment was to compare the final mass in our reaction to the initial mass and determine the change in mass.
The experiment apparatus consisted of an extra-large egg, 1/10 spoon of salt, olive oil, water, a spoon, a small sized bowl, a Continental Electric egg beater, an 8” flat frying pan, a cooking stove, and a kitchen stopwatch.
When using clear glue, use less food dye than when white glue. White glue is used when you want really bright colored slime.
To the dismay of some and a necessity for others, scales can be found about everywhere in today’s society. It never fails; if you go to the doctor you will step on the scale. They are at the grocery store, in most bathrooms and even in some of our favorite stores. Were we might even pay a quarter to have a machine tell us our weight, out loud. We as a society are obsessed with our weight. You’re asked for your weight when renewing your driver’s license. Every time you get in an elevator and see the little sign saying do not exceed *** lbs, the quarter-pounder with cheese and milkshake you ate for lunch, is brought back to your memory. A scale receives more mental and physical abuse than any other appliance that has ever been invented. All this abuse stems from a lesson each of use were taught at a young age, which is that we should always tell the truth. Well let’s look a little deeper into the scale and see the physics involved in how two different types’ of scales weigh objects.
Yes Aqueous Methanol Dark Red Yes Water Stayed purple No. Ceric Nitrate Test Substance Tested Observations Rxn? Water Yellow
Remove the extra solvent on a steam bath under a hood while flushing the flask with N2 gas, leaving the crude extract. Weigh extract.