The purpose of this lab is to focus on how to make zinc iodide in a different way using compounds instead of elements, which are barium iodide and zinc sulfate. We will see if the reaction between these two compounds will occur and make a prediction by writing a chemical equation. The procedures for this lab are to place a small test tube inside a 50mL beaker and weigh it. Then, using a spatula, add 0.45±0.03 g of zinc sulfate heptahydrate into the small test tube and record the mass. After that, dissolve the sample in 2 mL of deionized water and shake the test tube for 1 to 1 ½ minutes to dissolve the solid.
To perform this experiment, we will utilize emission spectra, titrations, and thermal gravimetric analysis, using knowledge from Experiments 10, 4, Titrations of Na2CO3 and NAHCO3 by HCl (hydrochloric acid) will be performed to determine the concentration of HCl, as well as the number of moles of HCl present within the sample of baking soda. As a result, we will be able to determine the molar concentration of HCl by determining its equivalence point (the point on the graph where the exact amount of rectant needed to perform a reaction has been added) from graphical analysis. Na2CO3(aq.) + HCl(aq.) ==> NaHCO3(aq.)
We are performing the experiment to gain our spots on the team of quality control for the Athenium Baking Soda Company. The purpose of the quality control is to determine the quality and safety of use of the baking soda. The theory behind thermal gravimetric analysis is that when a mixture is heated to a sufficiently high temperature, one component decomposes to form a gaseous compound while the other does not decompose. The mass is measured before and after the heating and stoichiometric ratios are used to determine the percent by mass. The chemical equation to be used is : 2NaHCO3(s) Na2CO3(s) + CO2(g) + H2O(g) In the second part, 1.0 M HCl will be titrated into a solution with a known amount of sodium carbonate (Na2CO3), the pH will be measured as it becomes more acidic and the equivalence point (the point at which HCL and Na2CO3 reach equilibrium) determined.
Kyla Emerine Date of Experiment: April 15, 2015 Report Submitted: August 17, 2015 Title: Colligative Properties and Osmotic Pressure Purpose: To observing changes of colligative properties in freezing and boring points, by adding salt to a solution. Procedure: In this experiment I performed various procedures such as adding different amounts of salt to tap water that was freezing or boiling and observed how it changed the temperatures. Data Tables: Data Table 1. Dialysis Tubing Results Time: |Mass of Dialysis Tubing and Contents | 0 minutes |6.5g| 30 minutes |6.8| 60 minutes |7.2| Questions A. In your experiment, is the light corn syrup in the dialysis tubing hypertonic or hypotonic to the water?
Problem Which dissolves in water better, salt or baking soda? Hypothesis If salt and baking soda where put in water then baking soda will dissolve better than salt. Abstract The purpose of this project is to determine which material dissolves better in water between salt and baking soda. The hypothesis is If salt and baking soda where put in water then baking soda will dissolve better than salt. One teaspoon of salt and one teaspoon of baking soda were put in two separate transparent glasses of water and then the time of dissolving of each substance were calculated.
Lab 4: Determination of Percent by Mass of the Composition in a Mixture by Gravimetric Analysis Introduction Thermal gravimetric analysis is used to determine the percent by mass is used to determine the percent by mass of a component in a mixture. When a mixture is heated to an appropriately high temperature, one component in the mixture decomposes to form a gaseous compound. The mass of this particular component is related to the mass of the gaseous compound. In this experiment, the percent by mass of sodium hydrogen carbonate (NaHCO3) and potassium chloride (KCl) in a mixture will be determined. Experimental First, we weighed 2 samples, each has 1 gram of NaHCO3-KCl mixture Second, we put the samples in 2 crucibles (A and B) and weighed them.
Lab # 4 : The Redox Arena II Procedural Summary There will be three different sized test tubes that will be used in this experiment, a boiling tube, a large and small test tube. The boiling tube will be labeled “R” for “reactants”. A scale with a weighing paper will be tared before adding 2 grams of granular zinc (Zn), record the mass, and then move the zinc to the boiling (R) tube. Weigh out 2 grams of iodine crystals, record it, and this will be added to the R tube, with the zinc. The R tube will then be put in a large beaker.
This was done by taking small amounts of the unknown acid. It was then placed into capillary tubes and inserted into the Bibby Sterilin Device. Starting with a high plateau to find a quick melting point and then proceeding to find an actual melting point. The next experiment that aided in finding more characterizations of unknown #2651145-PLF13 was equivalent weight. In order to find the equivalent weight a titration of the unknown acid had to be conducted.
Heats of Solution and Reaction Name: Cindy Hernandez Purpose: The purpose of this experiment is to decided if the chemical reactions are exothermic and endothermic. By finding the differences between each temperature. Overview: For this lab, we had three different chemicals involved NH4Cl, H2SO4, and NaOH. What we did with these chemicals was that we added water, except NaOH we added HCl, was that we combined both mixtures to determine if there was a temperature change. The reason why we're determining if their was a chemical reaction is to identify if it is exothermic or endothermic.
Double displacement reaction: Chemical reactions in which one component each of both the reacting molecules is exchanged to form the products. 3. What does the stoichiometry of a chemical reaction mean? Why is it important? Stoichiometry is a section of chemistry that involves using the relationships between reactants or products in a chemical reaction to determine the desired quantitive data.