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.
When the pipet was half emptied into the ice water a timer was started. This aliquot was the first sample taken at t=0. The sample was rapidly titrated with 0.100 M HCl to a phenolphthalein endpoint and the final volume was
These specimens were all tested before being placed into their respective ice or water baths. Afterwards they were placed in four different water baths, for intervals of two minutes. There were five intervals giving a total of ten minutes. After each interval, two drops were taken out of the test tubes and placed into the spot plate and results were recorded shortly after. For both the Human Amylase and Fungal Amylase the results yielded somewhat similar outcomes.
Title: 1pt Stoichiometry Of A Precipitation Reaction 2. Procedure: 2pt (Write the procedure in your own words after you have read the lab manual) Put on goggles the weigh 1.0 of CaCl*2H2O and put it in 100ml beaker. Add 25 mil of water and stir. I will then use stoichmetry to figure out how much Na2CO3 I will need for a full reaction. I will weigh this and put it in a separate cup.
2. Using the funnel, fill dialysis sacs with approximately 20ml of the specified liquid. Sac #1 and #2 filled with 40% glucose solution, sac#3 – 10% NaCl solution and sac #4 filled with 40% sucrose solution. They have to be weighted (data chart on table 1) and then each of the sac dropped into particular corresponding beaker. Sac #1 placed into beaker #1 with distilled water, sac #2 placed into beaker #2 with 40% glucose solution and so forth.
“Ice…Ice…Baby” “What is the quickest way to melt ice?” January 22, 2013 Abstract We choose to do this experiment in an attempt to discover what the quickest method for melting ice was. The purpose of this project was to find a way to melt the ice off the glass of a car windshield during the cold winter months. Our hypothesis was; if we added water to the ice it would melt quicker then adding either air or salt. The independent variable of the experiment was the molecular structure of the water found in the form of an ice cube. The dependent variable was the “amount” of time it took for all 3-ice cubes to melt.
Experiment #4: Muddy Waters Chemistry 1001 Taylor Ward Tuesday P.M. Rm. 106 T.A. : Kevin Monday October 24th, 2011 Abstract: For the first part of lab 4 we synthesized potassium aluminium sulfate dodecahydrate (KAl(SO4)2 12H2O), after the synthesis process was completed we used the product to try and clear a beaker of muddy water. We used aluminium that was dissolved into solution and the addition of an acid to create the final alum crystals; with these processes we were able to identify the percent yield of the alum. We could also determine the efficiency of our alum at clearing the beaker of muddy water.
Introduction: In lab 3, I will learn how to separate the mixtures of solids and get comfortable with the different techniques of separating the solids. Because the solids have a different chemical makeup, different techniques will be used to separate them. I will be using the four different solids: sodium chloride, benzoic acid, silicon dioxide, and iron and follow the directions in order to separate each solid according to their differences in chemical makeup. Material and Methods: The essentials to this lab will be distilled water, crushed ice for the ice bath, one 100 mL LabPaq glass beaker, burner fuel and stand, cylinder, funnel safety goggles, digital scale, magnet bar, and the mixtures of solids. In order to remove the iron filings I will use the iron bar since it the composition of iron will be picked up by the magnet.
An acid is a chemical compound that dissociates in a solution and releases hydrogen ions which lowers the pH. A base is the opposite so it donates hydrogen ions making the pH rise. A compound that neutralizes both acids and bases when added to a solution is referred to as a buffer. This is all tied together by the process of titration, which determines the concentration in a solution by adding to it a substance of known concentration in specific amounts. Before testing this experiment, I expected the pH to increase when the acid was added and to decrease when the base was added.
2. Measure and pour 10cm3 of Iodine solution and 10cm3 of starch solution into separate test tubes. 3. Place both test tubes into the beaker containing the ice water. 4.