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To find the densities of an unknown solid and liquid in order to determine what they are.

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Introduction

Name: Natausha Tackett Lab Partner(s): Sabrina Sekic and Terri Moore Lab Section #: 3 Title: Data and Calculations Date: September 7, 2005 Purpose: To find the densities of an unknown solid and liquid in order to determine what they are. Materials: Toluene(V) and Zinc(E) Equipment: A stoppered flask, and an analytical balance Safety: To begin the experiment, we wore our safety goggles. We were careful with the chemicals as to not get it on our hands, or clothes. When we were finished with our chemicals, we poured our "unknown liquid" into a container, specifically for that, located under the hood. We put our metal in the designated place, rinsed our flasks and the stoppers, and left them to dry. ...read more.

Middle

(V) By subtracting the mass of the empty stoppered flask from the mass of the stoppered flask filled with an unknown liquid, we found the mass of the unknown liquid. Next, through dimensional analysis, we found the volume of the flask, which is also equal the volume of the substance which it can hold. Having found this information, we were able to take the mass of the "unknown liquid" and divide it by the volume of the "unknown liquid" to get the density of the "unknown liquid. In the 2nd part of the experiment, we were trying to find the density of an unknown metal. First, we found the mass of the stoppered flask plus about 50 grams of the "unknown metal." ...read more.

Conclusion

Then, by subtracting the volume of the water, from the volume of the flask, we found the volume of the "unknown metal." Lastly, we divided the mass of the "unknown metal" by the volume of the "unknown metal" and found it's density. Data: is attached to the report. Observations and Results: Through this experiment, we observed that the density of the Toluene is 0.8669 g/mL. We also observed that the density of zinc is 7.14 g/mL. Conclusions: In our experiment, we did learn that you must be very precise with the information you observe. For instance, when we weighed our metal, it had previously been used, and not properly dried. This being our first lab experiment, we used it anyways. As a result, when we calculated the density of our "unknown metal," there were no matching densities. Therefore, we had to re-do the entire second part of our experiment. ...read more.

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