Chemistry Density Lab Essay

Submitted By mcm287

Words: 576

Pages: 3

Open Document

Renee Hairston POST-LAB 9/11/14
Determination of Unknown Density Lab
Lab Partner: Kelsee Rieghman

I. Objectives/Purpose
During this particular lab experiment I expect to determine the density of both a liquid and a solid to find out what the unknown substances are by matching it’s density with one of the densities of the 3 metals listed in our packet, and also determine what the unknown liquid will be based on its density and the given information in our packet.

II. Safety Precautions
The liquids used in this experiment may be highly flammable. No sparks or open flames. We will avoid breathing fumes from these liquids and keep them covered and in the fume hood whenever possible. Safety glasses or goggles will be worn at all times as well as effective hand washing.

III. Experimental Procedure and Data
My lab partner and I attempted to obtain as close to a 2.5g sample of the unknown solid as we could.
We then weighed a weighing boat, weighed the sample of the solid while on the weighing boat and subtracted the two to find the mass of the unknown solid.
Next, we filled a graduated cylinder to 5ml, as both partners verified.
Then, we carefully placed the unknown sample into the cylinder to record the amount of water being displaced.
The difference in the two would then determine the volume of the unknown.
To obtain the density use the formula: D=m/v

Trial
Mass Weighing Boat (g)
Mass Boat + solid (g)
Mass solid (g)
Volume solid (ml)
Density (g/ml)
% of Error
1
0.3470g
2.8534g
2.5064g
0.9ml
2.785g/ml
3.15%
2
0.0229g
2.5788g
2.5559g
0.9ml
2.839g/ml
5.15% Using the information charted, my lab partner and I found it safe to say that we concluded that the unknown solid would be Aluminum given that the accepted density was 2.70g/ml.

Next, we moved on to find the density of the unknown liquid.
We rinsed the pipet with the unknown liquid to ensure that all water inside the pipet would be gone.
Next, we obtained the mass of an empty but corked 50ml Erlenmeyer flask on an analytical balance.
We then used the pipet to place 10ml of the

Analytical Instrumentation

CHEMISTRY 361 Analytical Instrumentation Syllabus Spring 2012 Professor: Dr. Evans E-mail: jason.evans@umb.edu Telephone: 617-287-6149 Office hours: TH 8:30-10 or by appointment Office: Science 1-084 Lecture/Lab: M 11:00-11:50 and F 12:00-5:00 in S-2-41 Objective: This course provides a survey of the different types of instrumentation that is in the chemist’s tool box. We will stress advantages and disadvantages and develop the insight that is necessary to choose the right tool for the…

Words 1472 - Pages 6

Life Cycle Essay

Nicholas Wilcox September 17, 2014 Honors Chemistry Period 4 AP Chemistry Laboratory Report: Shipwrecked The theoretical foundations of the experiment “Shipwrecked” would be that the situation is very dire and is very life threatening. In order to survive, they will have to use their past knowledge, wits, and the supplies available to construct a contraption that will purify the ocean water that contains saltwater and debris from the sailboat…

Words 360 - Pages 2

Lab report ch 2 Essay

Department of Chemistry Techniques and Measurements Date Submitted: Date Performed: Lab Section: Chem-180 Course Instructor: Purpose To gain proficiency in determining the volume, mass, length, and temperature of a variety of items using common…

Words 704 - Pages 3

LAB 2 Essay

Kati B2.Density and C.3 Melting Point Determinations Experiment B2 Purpose: Finding the density of an unknown liquid to determine its identity. Data and Observations: Organic Compound Density (g/ml) Hexane 0.6603 3-methylpentane 0.6645 Heptane 0.6837 Cyclohexane 0.7785 1-propanol 0.8035 3-pentanone 0.8138 p-xylene 0.8611 Toluene 0.8669 Tetrahydroforan 0.8892 Ethyl acetate 0.9003 Technique Trial with Acetone: Trial 1 Trial 2 Mass of empty, capped vial 7.6705g 7.6859g Volume of liquid used…

Words 623 - Pages 3

Iodine Experiment

‘soluble, slightly soluble, or insoluble.’ Part 2: Density of Zinc Table 4-Volume of Zinc: Mass of Zinc (g) Volume of Water (mL) Volume of Water and Zinc Volume of Zinc 10.09 16 17 1 20 16 19 3 29.94 16 20 4 40 16 22 6 50.10 16 23 7 This table calculated the volume of Zinc. In order to determine the volume of Zinc, the volume of water (in this case 16mL) is subtracted from the volume of water and zinc (third column). Graph 1-Density of Zinc: This graph plots the volume of zinc…

Words 1634 - Pages 7

Essay on Determining Density

9/3-9/4 Determining Density Materials: PPE: goggles, aprons Dry 50 ml graduated cylinder Dry 100 ml graduated cylinder Balance RO/DI Water Squirt bottle Reference Chart of Water Density at various temperatures Thermometer (°C) 200 g reference standard Procedure: Days 1&2 1) Followed procedure as outlined in the handout with the following changes: Before doing step 1, find the mass of a 200 g reference…

Words 473 - Pages 2

Measurements Experiment Essay

Submitted: 9/15/13 Laboratory Techniques and Measurements PURPOSE: The purpose of this lab was to experiment using the International System of Units to determine mass, length, temperature, volume, and density of objects and liquids using common measuring devices and formulas. PROCEDURE: In this lab I performed several different exercises to learn how to obtain various lengths, temperature, mass, density, volume, concentration, and dilution. Length: I measured various items using the ruler…

Words 662 - Pages 3

Volume and Density Essay

Orlando Ibanez Chemistry 111 May 16, 2013 Density Lab Purpose: The objective of this experiment is to learn how to use basic laboratory equipment, such as the buret and analytical balance. We will learn how to calculate the density two different ways. First we will calculate the density using dimensional analysis with a ruler. Then we will calculate the density using volumetric conversions. Methods Part 1: Before you begin this part of the experiment, make sure your buret is clean and functional…

Words 677 - Pages 3

lab report Essay

CHM1032L pre/post lab instructions Preparation is a key to success in this lab. For this reason, you are required to thoroughly read through the experiment information presented in the lab manual, and complete a pre-lab for each experiment you do. The prelab must be completed prior to the day of the experiment. Each Friday I will ask to see your completed prelab before I allow you to enter the lab. If you have not finished the pre-lab, I will not allow you to enter the lab and you will receive…

Words 1046 - Pages 5

Death Penalty Essay

Experiment Number 2 Identification of substance by physical properties Prepared for: Laura, Mudaugh Prepared by: Mohamed, Seaid Rick February 14, 2013 Abstract: The purpose of this lab was to identifying unknown substances by knowing their physical properties as density, melting and boiling point, and their solubility in specific solvent. The unknown solid was determined and found to be a solid Nephthol. Also, the unknown liquid was determined and found to be Cyclohexane. Introduction:…

Words 1609 - Pages 7