CHEM 1151L

Survey of Chemistry One Lab Section 206

Preparation of Solutions- 10/27/09

Preparation of Solutions- 10/27/09


        The purpose of this laboratory experiment was for the student to advance in ability to prepare solutions of target concentration, use of analytical balances, and use of laboratory glassware. Goggles and other safety precautions must be observed throughout. To prepare a solution of target concentration based on molar concentration of mass percent involves the formulas for such units. Molar concentration, or molarity (M), is the number of moles in exactly one liter of solution. This is used because chemists want information about the number of reacting particles in a reaction and is often used as a conversion factor. Mass percent (m/m) of a solution is calculated by dividing the mass of the solute by the mass of the entire solution and multiplying it by 100. Scientists use this information to prepare solutions. An example of an application of this information would be in a hospital setting. Intravenous fluids going into a patients body must be a specific concentration so it does not overly disturb the balances withheld by the many semi permeable membranes of the body.

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        Data collected before the reaction included the molar mass of copper sulfate pentahydrate (CuSO4 ° 5H2O) found by the use of the values on the periodic table and the mass of copper sulfate pentahydrate (CuSO4 ° 5H2O) needed to prepare ten milliliters of a 0.140 M solution. Copper sulfate pentahydrate (CuSO4 ° 5H2O) is a light blue crystalline solid substance. The chemical reactions that took place involved hydration of copper sulfate pentahydrate (CuSO4 ° 5H2O) in deionized water and dilution of a stock solution. To calculate the volume of stock solution required, molarity of the solution is multiplied by the volume to be made ...

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