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Measurements and Significant figures

helpful assignment, will make it easy for you just follow the guid lin...
Course

chemistry (CHE100)

32 Documents
Students shared 32 documents in this course
Academic year: 2020/2021
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Abu Dhabi University

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LAB REPORT 1

Measurements and Significant figures

Aim:

To learn how to use quantitative techniques in laboratories with accuracy and precision.

Introduction :

While working in laboratories, it is a necessity to be on point with the measurements to achieve a truly successful experiment. What does it mean to be accurate and precise? It is to be as close as possible to all results that involve a certain formula or a measurement, and one way to achieve that is by using the correct tools and methods within the quantitative techniques. As an example, pipettes are used to accurately transport liquid in the desired amount to a container such as a beaker which is typically used to contain a liquid or stir and combine with another or heat up.

With the experiment conducted, we wanted to measure the accuracy of the pipette by measuring the volume of a certain liquid using multiple methods with the material listed below:

Materials:

  1. Test Tube
  2. Conical flask (glass flask)
  3. Beaker
  4. Liquid
  5. Burette
  6. Electronic balance
  7. Graduated cylinder

 Test Tube  Glass Flask  Beaker

 Burette  Electronic Balance

 Liquid

 50mL Graduated Cylinder

Methods:

 Using a beaker:

 Keep one of two beakers empty.

 Fill the second beaker with liquid (in this case it is water).

 Using a pipette:

How the results were obtained :

The theoretical value, also known as the

accepted or true value, is the value expected to

result from the experiment. In this case the

theoretical value of the volume of water in this experiment is 40 mL. If the

experiment is repeated multiple times with accuracy, the values obtained will be

closer and closer to the theoretical value.

The actual value, also known as the experimental value, is the value

obtained from an experiment. The experimental value must target the theoretical

value with minimal error. In this experiment, the actual value was obtained as

follows:

 The mass of the beaker alone was weighed to give a mass of 60 g.

 The mass of the beaker and the water together were weighed to give a total mass of 100 g.

 To find the mass of the water alone, the following equation was used:

Mass of beaker and H20 – Mass of beaker = Mass of H

100 g – 60 g = 40 g of H

 Now with that the mass of H20 was calculated, in order to find the volume of the H20 (the goal of this experiment), the density formula was rearranged and applied. (density of water is equal to approximately 0 g/mL)

Density =  Volume =

Figure 1 Azasoo, J. Q., & Boateng, K. O. (2015). Scientific research design. Research Gate. researchgate/figure/Examp le-of-a-Design-Science-Research- Methodology-23_fig10_

Volume of H20 = = 40 mL of H

 Significant figures rule applied. In the case of multiplication or division, answer must have the least significant figures.

 The final answer is the experimental or actual value.

 The percentage error was obtained as follows:

% error =

% error = = 0 %

 If the actual value is less than the theoretical value, then the percentage error will be a negative value.

 If the actual value is greater than the theoretical value, then the percentage error will be a positive value just as the case of this experiment.

Discussion

In this experiment, we measured the volume of the liquid by using three different

methods.

After finishing the experiment, we realized that the graduated cylinder is both less accurate and less precise than the pipette. After calculating the weight of a single beaker, we filled another one with water to use it later. We connected the pipette to the electronic device. Then we started our experiment which was to check the accuracy of our result .Mentioning that

the accuracy is how our results are similar to the true value. After we finished the experiment, the accuracy was based on the mean calculation of both methods, and judged based on how close each mean was to the target goal of liters that we measured by adding different volumes. In both cases,

Azasoo, J. Q., & Boateng, K. O. (2015). A Retrofit Design Science Methodology for Smart Metering Design in Developing Countries. Research Gate. Retrieved from researchgate/figure/Example-of-a-Design-Science-Research-Methodology- 23_fig10_

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Measurements and Significant figures

Course: chemistry (CHE100)

32 Documents
Students shared 32 documents in this course

University: Abu Dhabi University

Was this document helpful?
LAB REPORT 1
Measurements and Significant figures
Aim:
To learn how to use quantitative techniques in laboratories with accuracy and
precision.
Introduction :
While working in laboratories, it is a necessity to be on point with the
measurements to achieve a truly successful experiment. What does it mean to be
accurate and precise? It is to be as close as possible to all results that involve a
certain formula or a measurement, and one way to achieve that is by using the
correct tools and methods within the quantitative techniques. As an example,
pipettes are used to accurately transport liquid in the desired amount to a container
such as a beaker which is typically used to contain a liquid or stir and combine
with another or heat up.
With the experiment conducted, we wanted to measure the accuracy of the pipette
by measuring the volume of a certain liquid using multiple methods with the
material listed below:
Materials:
1. Test Tube
2. Conical flask (glass flask)
3. Beaker
4. Liquid
5. Burette
6. Electronic balance
7. Graduated cylinder
1

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