physical science grade 12 experiments memo 2022 titration

 

Grade 12 Physical Science Experiments: Titration (2022)

Titration is a laboratory experiment commonly used in physical science classrooms, where students measure the amount of a specific substance in a sample. The experiment involves measuring the amount of a liquid in a sample by slowly adding a reagent until the sample is neutralized. This is a valuable experiment as it helps students understand the reactions of acids and bases, and how to accurately measure the amount of a given substance within a sample.

Objectives of the Experiment

The main purpose of the titration experiment is to measure the amount of a given substance in a sample. This can be achieved through the following objectives:

• • Identify the type of acid and/or base present in a given sample.

 

• • Measure the amount of the acid and/or base in the sample.

 

• • Understand the chemical reactions of acids and bases.

 

• • Perform calculations to accurately measure the amount of a substance in the sample.

 

Materials Required

The following materials are required in order to successfully perform the titration experiment:

• • A titration flask and burette

 

• • An indicator such as phenolphthalein or methyl orange

 

• • A base such as sodium hydroxide (NaOH)

 

• • An acid such as hydrochloric acid (HCl)

 

• • A disposable pipette and a beaker

 

• • A graduated cylinder or measuring cup

 

Experimental Procedure

The following procedure outlines the steps to be followed in order to complete the titration experiment:

1. 1. Prepare the sample for titration. This involves placing a measured amount of the sample (acid or base) into the titration flask.

 

1. 1. Measure the amount of reagent (acid or base, depending on the sample) needed to neutralize the sample and record this in the burette.

 

1. 1. Add the reagent (acid or base) to the sample in small increments using the burette, and stir the mixture constantly.

 

1. 1. Add a few drops of indicator to the titration flask, and continue to add the reagent until the color of the mixture changes.

 

1. 1. Record the amount of reagent (acid or base) used up to this point and calculate the amount of the sample.

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Conclusion

The titration experiment is a valuable experiment for physical science students, as it allows them to understand the chemical properties of substances and measurement of substances in a sample. With the help of the experiment, students gain a better understanding of acids, bases, and the chemical reactions between them. The Ministry of Education is pleased to announce that Grade 12 Physical Sciences students will once again be participating in titration experiments in 2022. Titration is a laboratory technique used to measure the amount of an unknown substance in a sample. It is a powerful tool for accurately assessing the concentration of an unknown solution, as well as values for pH and other properties.

Throughout the course of the experiment, students will rely on key concepts from chemistry and physics to accurately measure the unknown sample. They will use techniques such as volumetric analysis, colour indicators, and pH measurements to assess their results. Furthermore, students will learn how to accurately calculate the overall concentration of the unknown substance.

This experiment will present Grade 12 Physical Sciences students with an invaluable opportunity to hone their problem-solving skills, as well as apply mathematical principles and scientific theories that they have learned in the classroom setting. As such, it provides an essential bridge between classroom lectures and hands-on experiences in the laboratory setting.

In order to successfully complete this experiment, students must be equipped with the necessary equipment and materials. This includes lab coats, safety goggles, gloves, and of course, the necessary chemicals and reagents. It is also important to note that students should always work in pairs, and must adhere to safety protocols and laboratory safety guidelines at all times.

Overall, this titration experiment is an essential component in the Grade 12 Physical Sciences curriculum, and is a great opportunity for students to practice what they have learned in the classroom in a practical setting. By participating in this experiment, students will have the chance to gain valuable insight, as well as develop their problem-solving and critical thinking skills.