The identification of the melting point of the organic acid was done to find another characteristic of the acid and to test the purity of the recrystallized pure acid. A 2-4 mm layer of unknown sample was placed into a capillary tube sealed on one end. Then the capillary tube was inserted into the side a Bibby Sterlin device. The plateau was set to 200°C on the melting point apparatus. Once the plateau temperature was reached, the sample was watched carefully. When the sample first began to melt and when it was fully melted was recorded. These numbers were the range of the melting point. A slow melting point of the unknown organic acid and a standard sample was completed next. A new plateau was set about 10°C lower than the observed melting point of the unknown sample. This time once the plateau was reached, the heating was no more than 1°C per minute. This gave a much more accurate read of both melting points. If the standard did not melt in the range listed on the label of the bottle, that meant the machine was not working properly. The standard sample and the unknown organic acid melted in their appropriate ranges.…
* Use analytical balance to find mass. Handle with tongs to avoid getting finger prints on crucible and lid.…
4. After getting the mass of the empty crucible and crucible cover, 3 grams of magnesium sulfate crystals were added to the COOL crucible.…
2. Crucible was heated gently to dry paper then heat was increased to burn the filter paper off, with the crucible tipped to allow good mixing with oxygen…
The precipitated calcium carbonate is then filtered, dried, and weighed. The moles of calcium carbonate, CaCO3, are equal to the moles of Group 1 metal carbonate, M2CO3, added to the original solution. Dividing the mass of the unknown carbonate by the moles of calcium carbonate yields the formula weight, and thus the identity, of the Group 1 metal carbonate.…
The procedure consisted of gathering measurements and observing. The first step was to gather all the necessary materials. Next we had to have the accurate measurements of the crucible with and without the substance that is Sodium bicarbonate. The Crucible had a mass of 11.53g and then 13.94g with Sodium bicarbonate. Subtracting it to find out the…
First thing to do is to gather the equipment and materials needed for this lab. These include a magnesium ribbon, a crucible and cover, ring stand, iron ring, crucible tongs, burner, balance, and safety goggles. Once all the items are ready and available, then the lab can begin. Measure the mass of the crucible by itself and record the data. Then take the piece of magnesium ribbon and break it into small bits. Place the bits into the crucible and measure them together. Then place the lid on the top and heat it with the bits inside for 2 minutes. Then use the tongs to tilt the cover and provide an opening. Then heat it up again for 10 minutes. Once enough time has passed, turn off the burner and allow the crucible to cool. Then measure it again. Once everything is cool enough to touch, put away all the materials and examine the data.…
Given the unknown colourless liquid it is essential that the structure is derived. Firstly it is important to determine the percentage composition of elements to work out the empirical formula. The empirical formula was found to be C10H12O and the mass of the unknown was 148.09 m/z which when calculating the molecular weight of the empirical formula it did equal 148.09 g mol -1. This means that the empirical formula is also the molecular formula. As 12.01x10 carbons +1.008x12 hydrogens + 16= 148.09 09…
Procedure: First, obtain a clean crucible, and heat it under a Bunsen burner until it is as hot as possible, about 15 minutes within a fume hood unit. The Bunsen burner will be used under the fume hood for the entire duration of the lab. Place a crucible on a wire gauge, and wait for the crucible and its lid to cool off completely. After cooling, obtain the weight of the crucible and lid by placing it on a petri dish to be placed on an electric balance (petri dish mass must be obtained prior) without using any hands; there will not be any touching of the fingers or hands to or on the crucible and subtract the mass of the petri dish to obtain the mass of crucible. (Mass is noted at 61.805g with crucible and petri dish, crucibles mass: 25.253g) tin is weighed between 0.9000g and 1.0g (for this expirement, .98g is weighed) and added to the crucible, which is placed back onto the non.ignited Bunsen burner. While the crucible is being held by the Bunsen burner stand, 10M Nitric acid is dropped into the crucible with the tin unitil there is no longer any kind of reaction from it. This takes nearly 100 drops. It will bubble and fumes will arise. When nothing further occurs after ten minutes, the Bunsen burner is lit with the tin and nitric acid inside. Heat for about 15 minutes, let the crucible with the now contained tin oxide, cool on the wire gauze again and measure its mass. Repeat the heating process without adding anything to the crucible for an additional 15 minutes. After finding the mass of the tin oxide, by subtracting the initial weight of the crucible from the weight of the crucible with the tin oxide, we can compare the two measurements.…
I measured the mass of the crucible with the balance and recorded it in my notes.…
This experiment will demonstrate the law of conservation of mass, and more specifically, how the law can be used to experimentally determine the empirical formula of our intended product, magnesium oxide. In this experiment we will learn how to:…
First we measured and recorded the weight of a crucible and its lid. Then we added some Sodium Hydrogen Carbonate into the crucible and measured and recorded the values again. After, we set up the apparatus as shown in Fig.1. We left the crucible over the fire for five minutes. Then we took it off and measured the weight of the Crucible and the residue. We then put it back on the fire to see if the weight would reduce further. This was repeated three times untill the compound was no longer reducing in weight.…
.2400 grams of the unknown compound. This is done in duplicate and purple-tinted precipitates are placed in Gooch crucibles. The precipitates are suction dried using ethyl alcohol then acetone to…
Record the mass of the magnesium ribbon and crucible with lid via the same analytical balance.…
First, the crucibles were washed to remove any other adhering compounds. Then, they were dried by being put inside an oven at a temperature slightly above the boiling point of water, 110ºC. Other methods for drying are available such as infrared drying, halogen drying and microwave drying, but the drying oven was used because it is the most accessible, and multiple samples can be determined at once. The weights were then measured after letting the crucibles dry and cool in a desiccator. Multiple weighings are required as a constant weight is needed, where the difference between two consecutive weighings is ±0.0003 grams. The ±0.0003 constant weight allowance was set because the heat from the slightly hot crucible reacts with the very sensitive analytical balance and would therefore cause some errors. This is also why the crucibles have to be cooled in a desiccator before being weighed. A constant weight is required to minimize the errors from natural factors like air humidity. Shown below is the table of values that our group obtained for the weights of the crucibles:…