Good tunes too background see using the pasco system

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Unformatted text preview: 64 of 232 Experiment 15: Titration of Vinegar General Chemistry I and II Lab Manual Concentration of Acetic Acid in Vinegar: Run Initial buret Final buret volume base moles of acid in dilution molarity of acid in dilution molarity of acid in vinegar 1 2 3 4 (if necessary) Average molarity: Standard Deviation: Average % w/v: Observations: Dakota State University page 165 of 232 Experiment 15: Titration of Vinegar General Chemistry I and II Lab Manual Pre-Lab Questions : 1. What is the dilution factor of our vinegar? 2. What volume of the diluted vinegar are we titrating? 3. What is the indicator? Dakota State University page 166 of 232 Experiment 15: Titration of Vinegar General Chemistry I and II Lab Manual Post-Lab Questions: 1. Most commercially available vinegar claims 5% acetic acid; how close did your results reflect this? What is the percent difference between what you found and what the manufacturer claims? 2. How comfortable are you with your results? If you had to testify in court, would you be willing to? 3. Site possible sources of error, and estimate if these errors would result in a final concentration that is too high, too low, or could be either. Dakota State University page 167 of 232 Experiment 16: Colligative Properties General Chemistry I and II Lab Manual Experiment 16: colligative properties Purpose: To gain experience with solubility and colligative properties Pink Floyd: A progressive rock band from the ‘80’s. Good tunes, too! Background: See “Using the Pasco System” Introduction: Do you remember the Crystalline entity from the first season of Star Trek Light (aka Star Trek: The Next Generation)? Do you remember how the entity referred to humans? “Disgusting bags of mostly water,” as memory serves. Not a bad description, since the human body is approximately 90% water. However, it probably would have been a better description to refer to humans as “disgusting walking solutions.” If our body is 90% water, that means we are 10% other “stuff”. Water can be thought of as the solvent in our bodies (the solvent can be thought of as the “carrier”; that in which the solute is dissolved), while the rest of the stuff (proteins, lipids, DNA, nutrients, waste, and a plethora of other things) can be thought of as the solute (the “active ingredients” in a solution; what makes the solution of interest). Typically, the solvent is the compound present in greater amounts, but this is not always the case; it is more generally correct to think of the solute as the active ingredient, that is, the reason for us to pick up the solution in the first place, while the solvent is the carrier for the solute. It is not technically correct to speak of “heterogeneous” or “ho mogeneous” solutions. All solutions, by definition, must be homogeneous. To be a true solution, you must have an even distribution of solute throughout every part of the solution. If you have an uneven distribution, then you have a mixture, which is heterogeneous. In fact, the line probably oug...
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This note was uploaded on 09/18/2012 for the course CHEMISTRY 1010 taught by Professor Kumar during the Fall '11 term at WPI.

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