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Molarity Calculations Essay

1618 words - 6 pages

Student Name: Fausto ZuritaPartner #1 Name: Alice ParkPartner #2 Name: Garret KernPartner #3 Name: Sherry FanDate: March 12, 2014Course Title: Magnet ChemistryCourse Teacher: Mr. LodalBlock: C and Period: 6Lab Experiment #2 ~ Molarity CalculationsPurposeThe purpose of this experiment was to determine the concentration of a solution using analytical chemistry. The purpose of this particular experiment was ultimately to determine the concentration of acetic acid in vinegar. This experiment gave students the opportunity to determine the chemical property of a solution in an experiment similar to the experiments performed by real-world scientists.IntroductionA solution is a homogenous mixture of two or more substances. A solution is formed when one substance known as a solute dissolves into another substance known as a solvent as a result of a chemical reaction between the two substances. One important property of a solution is the concentration of the solution. There are multiple ways that the concentration of a solution can be measured. The most common measurement of the concentration of a solution is known as molarity. The molarity of a solution is defined as the number of moles of a solute in one liter of a solution. Another common measurement of the concentration of a solution is known as mass percentage. The mass percentage of a solution is defined as the ratio of the mass of a solute to the mass of a solution. The mass percentage of a solution is expressed as a percentage. This experiment will determine the concentration of a solution in mass percentage. The purpose of this experiment is to determine the concentration of acetic acid in vinegar. In the experiment, two solutions, sodium hydroxide in water and vinegar, will chemically react. Vinegar is a solution that consists of water, H2O, and acetic acid, CH3COOH. Sodium hydroxide in water is a solution that consists of water, H2O, and sodium hydroxide, NaOH. The solution of sodium hydroxide-water was created prior to the experiment by adding 8 grams of sodium hydroxide to 1 liter of water. This pre-experiment procedure created a solution of 0.2 M which was needed molarity so that 20 milliliters of the solution would react completely with vinegar.Materials1 Glass Flask (250 mL)2 Glass Burets (500 mL)1 Pair of Eye Goggles1 Sheet of White Paper1 Chemistry Notebook30 Milliliters of Distilled Water500 Milliliters of Vinegar500 Milliliters of Sodium Hydroxide10 Milliliters of PhenolphthaleinProceduresGather all materials needed for the experiment.Put on your eye goggles to protect your eyes from broken glass.Fill one of the two glass burets with vinegar.Add 5.0 milliliters of vinegar into the glass flask carefully using the glass buret with vinegar.Add 30 milliliters of distilled water into the glass flask carefully using good judgment.Add 4 drops of phenolphthalein into the glass flask carefully using good judgment.Fill the glass buret that does not contain vinegar with sodium hydroxide.Measure...

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