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?
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.)
Background: The hypothesis builds upon past knowledge that Chromatography paper is used to separate mixtures. In the experiment being conducted, the solvent- water- will travel up the paper, separating the dyes as it does so. It is also understood that the RF value indicated the distance the dye travels in relation to the distance the solvent travels. From past experiences with food coloring, it spreads very easily in water. This is the reason for hypothesizing that it will have the highest RF value.
Look in the water bath on your table for a flask labeled DMA. This flask contains Davis Minimal Agar that has been autoclaved to make it sterile, and is being kept at 47 C to keep it liquefied. 3. Think about these important points in pouring a petri plate before doing it: a) You must work quickly, because once the container of minimal agar is removed from the bath, it will start to harden within 2-3 minutes. b) When pouring agar into the petri dish, pour just enough to fill the dish about half way.
* Then you will have to put the test tube in a water bath and leave it until the contents reach the same temperature as the water bath. * Then you will have to take the thermometer from the test tube and put a glass rod into it instead. * After this you will have to use a 2cm syringe to measure out 1cm of lipase to the beaker in the water for the temperature you are investigating. * Then add the lipase to the test
The watch glass was removed with the beaker tongs. Using a rubber bulb and a stirring rod to stir the solution continuously, 15.00mL of .25M BaCl2 solution was added to the solution in the beaker. The watch glass is replaced and the solution is keep hot but not boiling for 15 minutes. The precipitate was allowed to settle. When the liquid above the precipitate was clear, the solution was tested for completeness of precipitation when a few drops of BaCl2 solution were added from a pipette.
Then by writing a balanced chemical equation and using the titration formula, Nb+Ma+Va=Na+MbVb , the molarity is able to be determined. Procedure: 1) Using the graduated cylinder add 10.0 mL of water into the Erlenmeyer flask. 2) Add 5.0 mL of HCl into the flask using another graduated cylinder because acid goes into water when mixing them. 3) Add three drops of phenolphthalein indicator into the flask. 4) Swirl the flask in circular movements to mix the substances.
To get accurate result, this titration process are repeated for another two times. The entire procedure by which we obtain the molarity of a solution of one substance (NaOH) from an accurately known amount of another substance (KHP) is called standardization. The average molarity of the sodium hydroxide solution will be used in the next experiment. The second experiment is conducted to determine the molarity of acetic acid and mass percent in vinegar. 100mL of distilled water was added to 10mL of vinegar and followed by 1mL of NaOH was pour into the solution.
The Effects of the Changes in the pH of Vinegar when Milk & Water is added Biology 131 November 01, 2011 Lab Partners: Shanice Alexander I’vanya Hobson Abstract The pH scalevaries from (0-14) measuring the concentrations of hydrogen ions and indirectly hydroxide ions which are given by a pH number. We measured and analyzed the different fluids vinegar, water and milk in order to calculate their pH and identify their acidity, neutrality or alkalinity before fluids were mixed with water, the mixture can where they can become either acidic or basic. We then tested vinegar and water to calculate the pH and then the same repeated process for Vinegar and milk. We compared the in samples with varying Hydrogen ions concentrations and water had a constant pH of 7,Vinegar and Water and Vinegar and milk hadvarying pH levels. Vinegar and water had the highest Hydrogen concentration which was a pH of 3 compared to the sample with the lowest concentration and an absorption rate of 24 percent.
C121 Elementary Chemistry Lab I “Building a Better Water Filtration System: An Investigation of the Properties, Changes, and Composition of Matter” Ian McGrath September 30, 2012 Period 1 “Building a Better Water Filtration System: An Investigation of the Properties, Changes, and Composition of Matter” Objective – Make a filtration system to filter the polluted water Reference – Mr.Harnish Procedure – 1. Put on safety goggles and lab apron 2. Make a filtration system using the PVC pipe 3. Cover bottom with cheesecloth and tie it with a rubber band 4. Get 200 mL sample of polluted water and place into 250 beaker 5.