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Investigation 4

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Submitted By altheiss
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The experimenter should first collect all of the necessary materials in the list above. Once all of the materials are assembled, the next step is to carefully mass each piece of equipment provided by the equipment supplier; this includes the flask, graduated cylinder, pipet, and beaker. Place the flask on the digital scale and record the mass in a notepad. Be sure to clear out the measurement displayed on the scale after removing the flask from the balance. Repeat this process using the graduated cylinder, pipet, and beaker by interchanging the flask for the new piece of measuring equipment. The third step is to fill the burette with 20mL of distilled water. Fill a 100mL beaker with distilled water; then carefully pour the water into the burette using a funnel, until the hibiscus of the water line reaches 40mL. Next, place the 50mL beaker, the one that has been massed, underneath the burette. Slowly extract 10mL of distilled water by turning the nob at the bottom of the burette clockwise. Now, the mass of the beaker with the water inside must be recorded. Place the beaker onto the scale and record this weight. Subtract the original mass of the beaker without the water inside from the mass of the beaker with the water. This number is the mass of 10mL of water. Remove the water from the beaker. Repeat the process of filling the beaker with 10mL of water from the burette and recording data 2 more times for a total of three trials.
The next stage is to test the accuracy of the rest of the equipment. The first step in testing the accuracy of the flask is the fill a 100mL beaker with 30mL of distilled water. Slowly measure out 10mL of water into the flask by reading the hibiscus line of the water in the flask. Place the flask with the water onto the scale and record the weight in grams. Subtract the mass of the flask with water from the mass of the flask without water. The difference is the mass of the 10 mL of water; record this measurement in the notepad along with the rest of the data collected. Empty out the flask and repeat the process of filling the flask with 10mL of water and recording the difference to fulfill 3 trials of data. This process should be repeated in identical fashion with both the 50mL beaker, the pipet, and the graduated cylinder.

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