Determination of Relative Atomic Mass of Lithium

Evaluation of the relative atomic weight of lithium: In general, the accuracy of the experiment is good. However, through practice, accuracy can be improved; accuracy refers to the proximity of the results to real answers. I think that I experimented in consideration given conditions and period. Accurate results were obtained from the actual situation. However, looking back at the analysis section, we found that the relative atomic weight values ​​are not exactly 9, as shown in the periodic timeline.

In this study, we use two different methods to determine the relative atomic weight (Ar). In the first method, dissolve lithium of known mass in water and collect the generated hydrogen. You can use this to calculate the relative atomic weight of lithium. In the second method, titrate the resulting lithium hydroxide solution with hydrochloric acid of known concentration. It can also be used to calculate the relative atomic weight of lithium. My practicality is very good and I think that it is suitable for given work. After all, I achieved consistency and proved this experiment to be reliable and accurate. With three titrations, I got two identical titers. One has a titer of only 0.1 cm 3. (Refer to titration result table)

In the late 20th century, lithium became an important part of the cell's electrolyte and electrode due to its high electrode potential. Because of its low atomic weight, it has a high weight to power weight ratio. A typical lithium ion battery can produce about 3 volts per cell with a lead acid voltage of 2.1 volts and a zinc-carbon voltage of 1.5 volts. Unlike lithium batteries, which are disposable (primary) batteries using lithium or its compound as a negative electrode, lithium ion batteries can be charged and have high energy density. Other rechargeable batteries using lithium include lithium ion polymer batteries, lithium iron phosphate batteries and nanowire batteries.

Lithium-ion batteries are advanced battery technologies that use lithium ions as an important element of electrochemistry. During the discharge cycle, the lithium atoms in the anode are ionized and separated from their electrons. Lithium ions migrate from the anode through the electrolyte until they reassociate with their electrons and are electrically neutralized until they reach the cathode. The lithium ions are small enough to move through the micropermeable separator between the anode and the cathode. Due to the small size of lithium (after hydrogen and helium), lithium ion batteries can have very high voltage and charge storage per unit mass and unit volume.