Determination of the Relative Atomic Mass of Lithium
A-Level: Chemistry
Title:
Determination of the Relative Atomic Mass of Lithium
Description
The aim of this experiment is to determine the relative atomic mass of
Lithium using two methods. The first method is to measure the volume
of hydrogen gas produced when a known mass of lithium reacts with
water. The second method is to titrate the solution of lithium
hydroxide produced from the first method.
1. Set up the apparatus accordingly (as shown below). Use a standing clamp to hold the measuring cylinder upright.
2. Ensure the 100 cm measuring cylinder contains exactly 100 cm of distilled water.
3. Cut a piece of Lithium using a knife and mat.
4. Weigh the cutting of lithium ensuring it is clean and weighs approximately between 0.08g and 0.13g. Record the mass of lithium accurately and exact to 3 decimal places.
5. Remove the stopper from the conical flask, place the lithium in the conical flask and immediately replace the stopper to ensure no hydrogen gas escapes.
6. Collect the hydrogen gas in the measuring cylinder and record the final volume.
