# Laboratory Techniques and Measurements Essay

Words: 2311
Pages: 10

General Chemistry 1
Lab 1: Laboratory Techniques and Measurements

Purpose: The purpose of this lab is to ensure that students are able to understand how to conduct measurements of length, mass, temperature, density and volume using different measuring devices. Students will also learn how to dilute substances by using simple algebra.

Procedure: 1. Prepare a data table similar to Data Table 1 shown below. 2. Choose any three objects that are shorter than the metric ruler to measure, such as a CD, key, spoon, etc. a. Measure the objects’ lengths in centimeters. Estimate to one decimal place. Record the measurements in Data Table 1. b. Measure the objects’ lengths in millimeters. Estimate to one decimal place. Record the
Develop a hypothesis as to whether the density of the salt solution should be greater or less then the density of pure water. Record the hypothesis in the Lab
Report. Hypothesis: I think the salt solution would have a lesser density due to it being heavier.

Find the density of the salt solution using the formula d= m/V. Compare the results to the hypothesis.
5. All used solutions can be safely poured down the sink. Clean all equipment to be used for the next section.
6. Calculate the density of a small, irregular metal object using the water-displacement method. Record the results in a data table similar to Data Table 6 shown below.
a. Fill the graduated cylinder halfway with water. Record the volume of the water in column A.
b. Place the metal bolt into the graduated cylinder and record the new water volume in column B.
c. Subtract volume A from volume B. Record the value in column B – A. This value represents the volume of the object.
d. Weigh the bolt to determine its mass and record the value in Data Table 6.
e. Use this mass to determine the bolt’s density. Record the value in Data Table 6.
f. Calculate the density of the bolt using the formula d= m/V.
7. Use the water displacement method to calculate the density of the magnet. Record the results in Data Table 6.
8. Determine the density of a small, irregular metal object using Archimedes’ Principle.
a. Determine the mass of the bolt using the scale. Record the value in Data