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To determine what happens when an acid and an alkali are mixed

Module by: Siyavula Uploaders. E-mail the author

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NATURAL SCIENCES

Reactions that occur between different kinds of matter: acids and bases

EDUCATOR SECTION

Memorandum

Step 1: It turned blue, because bicarbonate of soda is an alkali

Step 2: No

Step 3: It became lighter

Step 4: It becomes much lighter and lime green

OBSERVATION:

  • Neutral

LEANER SECTION

Content

Activity: To determine what happens when an acid and an alkali are mixed [LO 1.2, LO 1.3]

We have already discovered that a neutral solution is neither an acid nor a base.

What can we expect to happen when and acid and a base are mixed together? Let's find out!

  • Use a Bromothymol blue solution as indicator
  • Other requirements:
  • 100 ml white vinegar
  • 150 ml bicarbonate of soda solution

STEP 1: Add a few drops of the bicarbonate of soda solution to the

Figure 1
Figure 1 (graphics1.png)

Bromothymol blue indicator.

What do you observe?

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STEP 2: Add half of the vinegar to the bicarbonate of soda solution

Figure 2
Figure 2 (graphics2.png)

Does this make the solution neutral?

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STEP 3: To determine this, you have to add drops of the mixture to the Bromothymol blue indicator.

Figure 3
Figure 3 (graphics3.png)

What do you observe?

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STEP 4: If no change has occurred, add half of the remaining vinegar to the bicarbonate of soda solution and repeat step 3.

Figure 4
Figure 4 (graphics4.png)

STEP 5: Test the solution again and repeat steps 3 and 4 until there is a change.

Figure 5
Figure 5 (graphics5.png)

What do you observe?

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OBSERVATION:

  • The vinegar and bicarbonate of soda formed a________________________ solution. It is neither an acid nor a base.

The process by which acids are destroyed by bases, or bases by acids, is called NEUTRALISATION.

Assessment

Learning Outcome 1: The learner will be able to act confidently on curiosity about natural phenomena, and to investigate relationships and solve problems in scientific, technological and environmental contexts.

Assessment Standard 1.2: We know this when the learner conducts investigations and collects data: organises and uses apparatus/equipment or sources to gain and record information;

Assessment Standard 1.3: We know this when the learner evaluates data and communicates findings: generalises in terms of relevant aspects and describes how the data support the generalisation.

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Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

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