Lab report 3 Bhakti Patel(Actual) PDF

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Molarity Conversion and Mass Determination CHEM 1014 Bhakti Patel

Introduction: The purpose of this experiment is to know basic molarity conversion and determine the masses. Proper knowledge of using lab equipment is required and know how to calculate the number of moles and the atoms of the compound. It is essential to know how to find the mass and molar mass of compounds. This experiment suggests regulating the number of mole present in water for a chemical trial and what the empirical formula is considered for a hydrate.

Materials and Methods For this experiment, there are just to have two exercises. It focuses and teaches on how to calculate the number of moles and know the atoms of various compounds that form their masses and molar masses. “ In real life, we often encounter substances that are mixtures of different elements and compounds. One example of a mixture is the human body(Khan Academy).” We need to wear all the appropriate safety equipment (goggles) before starting a lab experiment. These procedures are followed and are lined out by Hands-on labs (2015). It is essential to use our safety goggles when dealing with harmful chemicals and use appropriate handling tools for heated objects. For the first part of the exercise, there are four objects required(cotton ball, 2oz aluminum cup, a digital scale, and stirring rod). Firstly, the calculation of aluminum cups molar mass is required. Measuring the mass aluminum cup and then recording it in the table. Results are considered to calculate the number of moles that are present in the aluminum cup and record

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the data in the table. Next, the same steps are applied for the stirring rod and the cotton ball. Once everything is recorded in the data table place all the objects back in the lab kit. For the second part of the exercise, there are 4 objects required( 2oz aluminum cups, burner setup, scale, and alum sample). Next, measure the mass of the 1st aluminum cup and place the data in the table. Next, use the 2nd cup as a weight boat and use this time 2g of alum with it. Then transfer the alum to the cup 1 and measure the mass and record all the details in the table. Next, set the burner up. Now heat the alum that is placed inside the aluminum cup for about 5 minutes. Then let the cup cool and measure all its details once again and place them in the table. Next, repeat all these steps for the second heat readings and record the data. Next, blow off the burner and place it in a proper place so anything does not catch fire. Lastly, dispose of all the used cups and the alum into the trash and place back all the remaining supplies back into the kit.

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Data

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Results All the required calculations are given below.

molarity=number of moles of solute / number of liters of solution

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Conclusion: The experiment was an accomplishment for me. I was able to calculate all moles and atoms for each element by using their mass and molar mass. I was also able to determine the amount of mass, molecular mass, and moles of H2O that was released from heating the alum. I think I have gained a lot of knowledge and understanding when dealing with chemicals. I even learned how to use the appropriate tools and equipment for the lab and it has further my knowledge too.

Citations

Chang, Raymond, and Kenneth A. Goldsby. Chemistry. McGraw-Hill Education, 2016.

Hands-On Labs. (2015). HOL Courseware and Resources. Denver, CO

Libretexts. “13.5: Solution Concentration- Molarity.” Chemistry LibreTexts, Libretexts, 14 July 2020, chem.libretexts.org/Bookshelves/Introductory_Chemistry/Map

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%3A_Introductory_Chemistry_(Tro)/13%3A_Solutions/13.05%3A_Solution_Concentrati on-_Molarity.

“Molarity: How to Calculate the Molarity Formula (Article).” Khan Academy, Khan Academy, www.khanacademy.org/science/chemistry/states-of-matter-and-intermolecularforces/mixtures-and-solutions/a/molarity.

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