Instructions: Watch the video link and answer the following questions.
1. Video link: Buffer solution
https://www.youfmbe.com/watch?v=SwTHo- n2tM
2. Answer the following questions: (Draw answers based on the watched video and not from
any other sources such as books, e-books, and the help of Google)
a. What is the Buffer solution?
Based on the video, I’ll define a buffer solution as a solution that can resist change in pH
whenever small amounts of acids and bases are added. Additionally, I have also encountered
that buffer means to digest shock, that’s why it digests the shock of pH.
b. Discuss the basic concept of buffer solutions.
Based on the video, the basic concept of buffer solutions lets us know that when you put
some acid in water, the color of the water will change to red. Therefore, when the color changes,
the pH changes as well. The next one, adding base to water. As a result, the water turned into a
blue one. Just like the first example, when the color changes, the pH changes also. For the third
example in the video given, the acid is added to the solution but the color doesn’t change that’s
why the pH doesn’t change as well. In that last example, it added drops of the base too,
however, no changes occurred for both color and pH. To conclude, acid and base cannot
change the pH of the solution, therefore it is called a buffer solution.
c. Differentiate acidic buffers from basic buffers.
The two types of buffer solutions are acidic buffers and basic buffers, however, both of
them have differences with each other. While I was watching the video, I noticed that acidic
buffers are solutions that have a pH below 7 and contain a weak acid and one of its salts. On
the other hand, basic buffers are the opposite of acidic buffers because they have a pH greater
than 7. Also, these solutions are made up of a weak base and its conjugate acid as a salt.
d. Give examples of both acidic and basic buffers mentioned in the video. (Write the full name of
the solution and not the chemical formula.)
Examples of acidic buffers are the mixture of hydrogen cyanide and sodium cyanide, the
mixture of acetic acid and potassium, and the mixture of carbonic acid and sodium.
Examples of basic buffers are the mixture of ammonium hydroxide and ammonium
chloride and the mixture of ammonium hydroxide and ammonium sulfate.
e. Discuss how buffer solutions work.
In the video, the working of the buffer solution also means how it maintains a constant
pH. Buffer solution works by simply neutralizing any added acids and bases.
f. Why is strong acid not used in preparing buffer solutions?
