Use tongs to re-position the lid so that it covers the open crucible. Use tongs to transfer the crucible to the balance.
DO NOT place anything hot directly onto the lab bench, always place hot objects on a heat resistant mat. Slide a Bunsen Burner on a blue flame not a smokey yellow flame under the crucible so that the hottest part of the flame the top of the inner blue cone is directly heating the bottom of the crucible.
Keep your pens, notebooks, etc away from the flame Do not breathe in any fumes coming out of the crucible. Using tongs, place the crucible on the pipe clay triangle and position the lid so that it is slightly off-center to allow air to enter but prevent the magnesium oxide from escaping.
Clean a 35 mm strip of magnesium about 0. DO NOT look directly into the crucible while it is being heated!
Wind the magnesium strip around a clean glass stirring rod to obtain a loose coil and place this inside the crucible and place the lid on the crucible. Light the Bunsen Burner, and obtain a blue flame, and use this flame to brush the bottom of the crucible for about 1 minute until the magnesium starts to burn as evidenced by a bright glow within the crucible, then place the Bunsen Burner under the crucible and heat strongly until all the magnesium turns into a grey-white powder about 10 minutes.
Experiment to Determining the Empirical Formula of Magnesium Oxide In this experiment we will be using a piece of apparatus known as a crucible.
This is known as heating to incandescence. Continue this heating, cooling and weighing process until you achieve a constant mass. While still on a blue flame, slide the Bunsen Burner out from under the crucible before turning it off to prevent soot attaching to the crucible.
A crucible is preferable to using a glass test tube in this experiment because: Safety Wear safety goggles eye protection. If you have to walk with the crucible to the balance, hold the crucible in the tongs and support it with a heat resistant mat under it to take it to the balance for weighing.
Remove the Bunsen Burner, and allow the crucible to cool back to room temperature, then weigh the crucible and lid again. Producing the magnesium oxide. This is done to prevent contaminants from the air, especially water, from entering the crucible while it is cooling.
Remove the crucible from the pipe clay triangle using tongs to prevent contaminants from your hands being transferred to the crucible. DO NOT place anything hot on a balance!
The bottom of the crucible should glow red-hot for about 20 seconds. Use tongs to re-position the crucible back into the pipe clay triangle with the lid slightly off-center as before, and heat strongly for a few more minutes. Weigh the clean, empty crucible and lid and record its mass.
Cool the clean, empty crucible and lid to room temperature without removing it from the pipe clay triangle. Heat for 5 minutes to burn off any contaminants that may be present. A crucible is ceramic vessel with a lid used to hold substances that are heated to high temperatures.
Weigh the crucible, lid and magnesium remember not to handle the crucible with your hands, use tongs. Assume that anything that is being heated or has been heated is hot. Do not place anything near the open flame. Do not touch these items without first trying to feel for heat being radiated off them without touching them.
DO NOT touch the crucible, if it is hot you will be burnt, even if it is cool you will be adding contaminants from your hands!View Notes - Lab Rpt 4: Determining Empirical Formulas from CHM at Norfolk State University.
1 Abstract: The purpose of this experiment was to determine the empirical formula of a compound that%(2). Empirical Formula Lab Report - Free download as Word Doc .doc), PDF File .pdf), Text File .txt) or read online for free. The Determination of a Chemical Formula Lab Report. No description by lindsey pitts on 16 November Tweet.
Comments Calculate the empirical formula of the copper chloride compound The Determination of a Chemical Formula Lab Report Steps Set up 1.
Obtain and wear goggles. The empirical formula of a compound gives the lowest whole-number ratio of the constituent atoms that is consistent with the mass ratios measured by experiment.
In this lab, magnesium metal (an element) is oxidized. Empirical Formula of Magnesium Oxide by Experiment Chemistry Tutorial DO NOT place anything hot directly onto the lab bench, always place hot objects on a heat resistant mat. DO NOT place anything hot on a balance!
2. Producing the magnesium oxide. Clean a 35 mm strip of magnesium (about g) using emery papery or steel wool so that it is. Lab of Determining an Empirical Formula B2 Honors 12/18/13 Abstract In this lab, to help better understand the concepts of gram atomic masses and empirical formulas, we found the gram atomic masses and empirical formula of a binary compound.
The two compounds should form a definite whole number ratio by mass.Download