Unit 4 Introduction Acids and Bases Project

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Jvyqzna901

Science

Description

In this Unit, you learned about acids and bases. You will complete the activities below to demonstrate your understanding.

First, procure the materials from the list below. These should be relatively easy to find at your local pharmacy or drugstore.

Then, study the objectives and consider the essential questions to prepare yourself to begin.

Follow the procedure closely. Take notes of your observations and questions as you move through the experiment.

At the conclusion of your experiment, answer the Analysis questions. Be thorough as you respond to these important questions - your overall Analysis Portion should be three to four pages in length (750-1000 words). Remember that this is the cumulative project for the course, and should demonstrate everything you have learned.

pH Scaling: Acids and Bases Lab Activity

Objectives: Students will be able to:

  • Compare and contrast the hydrogen ion concentration for various acid and base solutions
  • Determine what happens when vinegar and baking soda are mixed
  • Use pH indicators to determine the acidity of a solution
  • Test various substances to determine if they are acidic or basic

Part I: Essential Questions

  1. What is the pH scale?
  2. How are acids and bases measured by a pH indicator?
  3. How are acids and bases different?
  4. What types of substances are considered acids and bases?

Materials:

  • Copies of Acid/base lab sheets
  • pH litmus paper (pH testing strips)
  • Variety of solutions (lemon juice, vinegar, water, tea, milk, soap, baking soda)
  • Goggles (Safety Precautions) **Students must wear goggles!
  • Do not taste or directly inhale any of the solutions

Procedure:

  1. Choose 5 different substances to test.
  2. Hypothesize whether each substance is an acid or a base. Record on the table below.
  3. Put each substance in a test well. If it is a liquid, test the liquid directly. If it is a solid, it needs to be mixed with water so the pH can be determined.
  4. Dip a pH strip into each of the 5 substances and allow it to sit for 10-20 seconds. Using the pH scale on the pH strip container, measure the pH level and record it on the chart.

Part II: Data Table: Measurement of pH

Name of Substance

Hypothesis (is it an acid or a base?)

pH Level

Acid, base or neutral?

Part III: Analysis questions:

Part III: Analysis questions:

  1. What does the pH scale indicate?
  2. What is an acid? Where are they found on the pH scale? What is a base? Where are they found on the pH scale?
  3. Were any substances tested neutral? Why or why not? Explain your answer.
  4. Were any of your results surprising? Why or why not?
  5. Write five facts you learned about acids and bases.


everything must be completed what you see is what needs to get done asap!

all activities must be done for my satisfaction thanks,

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Explanation & Answer

Hello there,As promised to you, I am back with the final version of my work. I am attaching to this message a Microsoft Word (.docx format) file entitled "Ph Scale Laboratory Report final" which contains the report as discussed.As you can see there is a 705 word conclusion as the professor requested and all the answers asked are answered on the last page. Plagiarism level is 0% and all the graphics/ charts are attached . The format i used is APA. I think that is what you needed me to work on.

Ph Scale Laboratory

PH Scale Laboratory Report

Laboratory Report
Ph Scale Laboratory Report
Introduction
Ph scale is used in order to determine if a specific substance is acidic, alkaline or neutral. This
determination is done by measuring the concentration of hydrogen ions. A lower value (under 7)
is considered acidic while a higher value (over 7) is considered basic. Substances which show up
with a value that equals 7 are what we call neutral, such as water. The ph scale can even go lower
than 0 or over 14, but it's not frequently used and it shows us that the tested substances are either
very strong acids or very alkaline. The determination process is very easy to be done and it only
requires a ph indicator which changes its color based on the value mentioned before. For an ever
more exact measurement, a spectrophotometer can be used.
Hypothesis
For today's experiment, we are going to examine the ph value of 5 common things which can be
found in most households: lemon juice, baking soda, cow's milk, toothpaste, and beer. At the
end of the experiment, we should know which of these substances are acidic, alkaline or neutral
and what is their approximate value. I expect the lemon juice to have a lower value because it is
made from a citric fruit and beer the same because it contains a high amount of carbon dioxide.
On the other hand, I expect the milk that I used to be neutral while the toothpaste is required for
a good cleaning of the teeth I expect it to be more acid. The baking soda should have a high
value on the ph scale because it is often used to diminish the symptoms of acid reflux.
Methods
Needed materials:
-Acid/Base laboratory sheets

Laboratory Report
-P...


Anonymous
Excellent resource! Really helped me get the gist of things.

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