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Lab Practica1.docx - Lab Practical Testing Your Lab Skills...

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Lab Practical: Testing Your Lab Skills Introduction: During the course of this semester it is our sincere hope that you have acquired many new skills. As a method of testing these new abilities, these final two tasks are designed to measure your knowledge and skills. The first task will involve determining the density of an unknown solid and the second will involve the titration of a diprotic acid. Finally, all students will be performing this lab entirely by themselves and are not allowed to communicate with other students during the allotted time of 75 minutes. Background: In the first lab of the semester you were asked to determine the density of both liquids and solids. In the first task, you will determine the density of an unknown solid which requires that you measure both its mass and volume and then apply the formula (1): (1) Density= mass (g) volume (mL or cm 3 ) The mass can be found using a scale, but finding the volume will offer up the two methods that you were shown in the first week of lab. A volume of a solid can be found for a larger object using a ruler and applying a volume formula. This works best when the object has regular dimensions (rectangular, cylindrical, or spherical) and generally is large enough to get good results.
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