Stoichiometry Lab Report

In order to find the amount of a product made during a double displacement reaction, the product has to be separated from the solution. From this number of moles of precipitate can be calculated. From there the number of moles of reactants can be calculated using the mole ratios of the particular reaction that occurred. As seen in Table 5 it is shown that by finding out the number of moles of the unknown, the molar mass of the unknown can be calculated. From the found mass of the unknown compound, the mound of the original ion can be found.

Malachite was synthesized using the following reaction (1): 2CuSO4*5H2O(aq) + 2Na2CO3(aq) CuCO3Cu(OH)2(s) + 2Na2SO4(aq) + CO2(g) + 9H2O(l) Based on this chemical equation, two moles of aqueous hydrated copper (II) sulfate reacted with aqueous sodium carbonate, a precipitate of copper (II) carbonate hydroxide was formed along with aqueous sodium sulfate, gaseous carbon dioxide, and liquid water. The copper (II) carbonate hydroxide precipitate is also the malachite that was obtained from the solution. It was known that a chemical reaction was occurring when the copper (II) sulfate solution was mixed in with the sodium carbonate based on the fact that the color of the solution changed from blue to light blue and the solution frothed. The malachite

One of the reactions you observed resulted in this product: NaCl + H2O + CO2 (g)? What well did this reaction occur in? Describe how the observations for this reaction support your answer. B BoldI ItalicsU Underline Bulleted list Numbered list Superscript Subscript70 Words A reaction I observed in number 1.)

Yara Mneimneh Ms. Nasrin Vali Biology 11 B 9. October. 2016 Osmosis Investigation Introduction Osmosis is the passive movement of water molecules across a selectively permeable membrane, from a region of low solute concentration to a region of high solute concentration. Osmosis is different than diffusion, since the net movement of the water is due to the solute concentration rather than the molecules.

Glacial acetic acid and acetic anhydride were added to the mixture while refluxing, which converted the lime colored solution into a clear mixture. The flask was cooled in an ice bath and the solution

Add sodium carbonate (Na2CO3), to the calcium chloride you already have. This will make calcium carbonate ( CaCO3), according to the formula: Na2CO3 + CaCl2 -> CaCO3 + 2NaCl. Afterward, filter this solution to obtain the calcium carbonate. Finally, heat the calcium carbonate at 248 degrees Fahrenheit to dry it out. Heat the calcium carbonate to 1,832 degrees Fahrenheit to get CaO.

Weighed 1 gram of NaC2H3O2 and mixed it with ionized water. Boiled 12 mL of 1.0M Acetic Acid added into a beaker containing the sodium carbonate on a hot plate until all the liquid is evaporated

Stoichiometry is a method used in chemistry that involves using relationships between reactants and products in a chemical reaction, to determine a desired quantitative data. The purpose of the lab was to devise a method to determine the percent composition of NaHCO3 in an unknown mixture of compounds NaHCO3 and Na2CO. Heating the mixture of these two compounds will cause a decomposition reaction. Solid NaHCO3 chemically decomposes into gaseous carbon dioxide and water, via the following reaction: 2NaHCO3(s) Na2CO3(s) + H2O(g) + CO2(g). The decomposition reaction was performed in a crucible and heated with a Bunsen burner.

Background Information: All cells are covered by cellular membranes. They are selective barriers which permit the selective passage of water, ions and other molecules between the cell and the outside solution. When two solutions having different concentrations of ions and molecules are separated by a semipermeable membrane, there will be some exchange between them. This will happen because they tend to equilibrate the concentrations and the osmotic pressure of the solutions, in order to be the same for both of them.

actococcus lactis ssp. lactis C2 and bacteriophages c2, ml3, sk1 were obtained from T. R. Klaenhammer (North Carolina State University, Raleigh, NC). Both bacterial Lactococcus lactis ssp. lactis C2 stains and bacteriophages c2, ml3, sk1 were stored in microcentrifuge tubes at -80℃ refrigerator to keep frozen until use. 3.3 Preparation of M17 medium, skim milk, Bottom agar, Top agar and CaCl2 solution M17 medium, skim milk, Bottom agar, Top agar and CaCl2 solution were all prepared in lab 201 in Garrugus building (University of Kentucky).

This lab further verifies the law of conservation of mass, a concept that is pivotal to the very nature of stoichiometry. By using molar methods and evaluating reactions through stoichiometric means, the experiment addresses the validity of the understanding regarding chemical reactions. This work is important in addressing the scientific nature of repeatability and evidence, which further supports the concept of conservation of mass, a part of the very foundation of thought within

1.5.1. Calcium carbonate Calcium carbonate is one of the most abundant calcium salts present in the earth's crust. Calcium is an alkaline earth metal with the atomic number 20, chemical formula Ca2+, represents about a third of the metals abundant in the earth and is essential for the life of living organisms. In fact, it is the essential component of a balanced diet, as well as the formation of bones and teeth and oversees important physiological functions (37).

Sulphuric acid One of the most important chemicals used in the industrial revolution was sulphuric acid (H2SO4), as it had many different uses in textile and metallurgical industries. Due to its importance, it was in high demand and the amount which could be produced was constantly trying to be improved. It was during this period that a scientist by the name of John Roebuck discovered that this chemical could be produced at a much larger scale than once thought. He did this by making small changes to the production method.

The percentage of CaCO3 from this experiment is about 20.14% which is close with the

Introduction This module is all about Stoichiometry, composition and reaction. I chose this topic not because I am having a really hard time understanding it, but because I want to have a deeper understanding of the lesson. Before actually doing this, I watched some videos on YouTube in order to look for some techniques I can actually apply in doing some written works and execute as an example for this module. In this module, I will focus more on the different techniques on how to convert unit to unit that I learned from different sources and some I self-learned, and of course some from the discussion done by our teacher.