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# Lab Experiment : The change in mass when magnesium burns. (Finding the empirical formula of an oxide of magnesium)

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Introduction

Lab Experiment : The change in mass when magnesium burns. (Finding the empirical formula of an oxide of magnesium) Data Collection: Table showing the weight of the products recorded and processed. Trial run 1 2 3 4 5 Mass of crucible + lid (� 0.0001g) 27.2160 24.1874 32.9232 27.2815 32.9220 27.6400 Mass of Crucible + lid+ magnesium (� 0.0001g) 27.6096 24.5431 33.1472 27.6068 33.1552 27.9850 Mass of magnesium1. (� 0.0001g) 0.3936 0.3557 0.2240 0.3253 0.2332 0.3450 Mass of crucible + lid + magnesium oxide before heating to constant mass (� 0.0001g) 27.8326 No data 33.2711 No data 33.2811 No data Mass of crucible + lid + magnesium oxide after heating to constant mass (� 0.0001g) 27.8256 24.7389 33.2605 27.685 33.2725 28.2125 Mass of magnesium oxide (� 0.0001g) 0.6096 0.5515 0.3373 0.4035 0.3126 0.5725 Mass of oxygen combined with magnesium2. (� 0.0001g) 0.2167 0.1958 0.1133 0.0782 0.1296 0.2775 1.The mass of magnesium ribbon = The mass of the crucible, lid and magnesium- mass of the crucible and lid. 2. Mass of oxygen = mass of magnesium oxide, crucible, lid - mass of magnesium, crucible, lid. Trail run: Observations: (Observations are made by lifting the lid after every 2 minutes) 1. Nothing. 2. Nothing but crucible glows red at the bottom. 3. White smoke . 4. Flame inside and lots of white smoke(fumes). 5. Sparkles and less smoke. ...read more.

Middle

Observations: (Observations are made by lifting the lid after every 2 minutes) 1. Nothing. 2. Nothing but crucible glows red at the bottom. 3. White smoke. 4. Sparks and glow. 5. Little smoke, sparkle. 6.Fame and white fumes. 7.Glow, white smoke and flame. 8. Magnesium ribbon half burned and there is flame inside. 9. No flame but it glows. 10.Less sparks and less glow. 11.White fumes. 12. Wispy fumes. 13. No smoke(white fluid material and residue on lid). 14. No further reaction. Raw Data: Initial mass of crucible with lid ( in grams) + 0.0001= 32.9220g Mass of magnesium inside crucible with the lid ( in grams) + 0.0001 =33.1552g Final mass of (MgO) inside crucible with lid in grams + 0.0001=33.2811g Mass of MgO inside crucible with lid in grams after �heating to constant mass`=33.2725g Processed Data: Percentage uncertainty= 0.04% 1.Mass of magnesium (in grams) + 0.0001= 0.2332g (The mass of magnesium ribbon = The mass of the crucible, lid and magnesium- mass of the crucible and lid) 2.Mass of oxygen that combine with Mg ( in grams) +0.0001= 0.1173g (Mass of oxygen = mass of magnesium oxide, crucible, lid - mass of magnesium, crucible, lid) 3.Number of moles of magnesium. = 0.0090Mole (the number of moles of magnesium = mass / atomic weight . The atomic weight of magnesium is 24.3 g / mole ) ...read more.

Conclusion

May be the lid is not placed properly on the crucible. There are some uncertainties in weighing it. It took long time to place lid back on the crucible as we were not able to lift the lid with the tong and even one lid fell down and broke. Realistic modification to the experiment that explicitly addresses the error(s)/weakness(s) that I identified: The magnesium ribbon should be cleaned using the emery paper. The proper caution should be taken while weighing the product and insure that reading on measuring balance is zero before you weigh it. After lifting the lid, cover the crucible properly with the lid to prevent the loss of the product. Practise lifting the lid before conducting experiment so that lid is placed back on the crucible quickly. While it is necessary to lift the lid to allow some oxygen to get in and to see if the reaction is finished, and therefore some loss of product is unavoidable, I do not think that the procedure made it clear just what impact this could have on the results. I also think that checking every two minutes was excessive. Therefore, in the future I think that this error could be minimized by placing an explicit warning in the procedure and by increasing the checking time to every five minutes instead of two. The only solution to this problem would be to ensure that the lid is on the crucible and to carry it as carefully as possible to prevent the loss of the product. ?? ?? ?? ?? ...read more.

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