Nest two Styrofoam cups within one another 2. Turn on magnetic stirrer 3. Insert probe into cardboard lid 4. Pour 25mL of water into calorimeter 5. Determine initial temperature of water 6.
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.
Materials: 3 beakers Thermometer 3 Alka-Seltzer tablets Stopwatch Mortar and pestle Source of hot water Ice cubes Graph paper Procedures: Hot water- Run water from the hot tap until it is hot as possible Fill beaker with 80 mL of hot water Use thermometer to take temperature of water. Record in data table. Remove 1 Alka-Seltzer tablet from package Drop into the water. Measure the time it takes for the tablet to completely dissolve. BE READY WITH THE STOPWATCH.
Do an initial Benedict's test on the 15% glucose/1% starch and the beaker solutions for glucose by putting some of the solution and a roughly equal amount of blue Benedict's solution in a test tube, placing the test tube in boiling water for 90 seconds, and observing whether or not the solution changes color from blue. 3. Form a bag out of dialysis tubing by tying off one end, putting in enough 15% glucose/1% starch solution to fill it halfway, and tying off the other end leaving the other half of the bag void of anything (even air). Write down the solution's color. 4.
After 1 hour we boiled a beaker of water on the hot plate (for Benedict’s and AgNO3 test). 5. We took all of the dialysis sacs
Liquids and Solids Purpose: The goal of this experiment is to be able to identify melting/boiling points of substances. We can then use these methods to identify unknown substances because of constants in melting/boiling points. Procedure: 1. Boiling Point a. Begin by adding 1 mL of rubbing alcohol to test tube and attach a thermometer to it.
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. 4. Using the balanced chemical reaction between Sodium carbonate and Calcium Carbonate given in page 92 of your lab manual (first paragraph of procedure), find the mass of Sodium Carbonate (in grams) needed in reaction? Na2CO3(aq)+CaCl22H20(aq)-CaCO3(s)+2NaCl(aq)+2H2O Date:_____3/30/2015____________ Name______Chloe Flake______________ 1. Title: 1pt Stoichiometry Of A Precipitation Reaction 2.
Obtain a clean-dry test tube. Place 0.3g of the unknown substance in the test tube. Next, add 10mL of distilled water to the test tube. Mix with a stirring rod until unknown is dissolved. 2.
-Name of the experiment: The study of titration (volumetric analysis) -Purpose: To investigate the titration two standard solutions with opposite pH values and the relationship between pH value and volumes of the reactants. Use this method to determine active ingredients in a commercial basic product. -Task Procedure: Section 1: The making of a standard solution of sodium hydroxide. Section 2: The use of a pH probe and computer program to produce a simple titration curve. Section 3: The titration of an unknown concentration of HCl with the standard solution of NaOH.
NaNO2 (.0217 mol) was added to the solution and was allowed to react for five minutes. 6M HCl was added slowly to the solution, and then allowed to cool for one hour in an ice bath. The reaction was vacuum filtered to a orange color, and washed with water, ethanol, and ether. The product was allowed to dry for five minutes on the funnel. The resulting product was [Co(NH3)5ONO]Cl2 based on the collected data and yield was 1.215g (.00465 mol, 77.19%) Summary of Physical Properties: [Co(NH3)5Cl]Cl2: Bp 278 °C (lit1 = >150°C) IR in cm-1: 3255 (s, N-H