Uji Glukosa - uji menggunakan Fehling A dan Fehling B

Summary

In this educational video, the host demonstrates a glucose test to determine the sugar content in everyday foods. Using ingredients like carrot juice, lemon, and tomato juice, along with sugar and milk, the process involves mixing these into solutions and applying a glucose indicator solution. After heating the mixtures, the presence of glucose is indicated by a red precipitate at the bottom of the reaction tubes. The experiment concludes with a comparison of the results, revealing which foods contain glucose and which do not, providing viewers with a hands-on method to explore the sugar content in their diets.

Takeaways

• 🔍 The video is about a glucose test to determine the sugar content in everyday foods.
• 📝 The required materials for the glucose test include carrots, lemons, tomatoes, sugar, and milk.
• 🔬 The materials are prepared as solutions: carrot, lemon, and tomato juices, sugar dissolved in water, and milk.
• 🧪 The equipment used includes a burner, a tripod, a reaction tube with a rack, a glass beaker, a dropper, and a wooden clamp.
• 🏷 The first step is to label the reaction tubes and place the prepared solutions into them.
• 🔴 The initial color of each solution is noted before the test, ranging from orange for carrot juice to red for tomato juice.
• 💧 The test involves heating water to a certain temperature and adding 10 ml of each solution to be tested.
• 📝 The Fehling solution A and B are used as indicators, with three drops of each added to the solutions.
• 🔑 After mixing the indicators, the solutions are shaken and the initial color changes are observed.
• 🔥 The solutions are then heated in a glass beaker with hot water for about 5 minutes to observe any color changes indicating the presence of glucose.
• 📊 The presence of glucose is confirmed by the formation of a red precipitate at the bottom of the reaction tube.
• 🍎 Among the tested substances, carrot juice, milk, sugar solution, and tomato juice showed the presence of glucose, while lemon water did not.
• 👨‍🏫 The video encourages viewers to try the test at home or in the laboratory when they return to school.

Q & A

What is the main purpose of the glucose test described in the script?

The main purpose of the glucose test is to determine the glucose content in everyday foods.

What are the materials used in the glucose test according to the script?

The materials used in the glucose test include carrot juice, lemon juice, tomato juice, sugar, and pure milk.

What are the tools required for the glucose test as mentioned in the script?

The tools required for the glucose test include a burner, a tripod, a reaction tube with a rack, a glass beaker, a dropper for the indicator solution, and a wooden clamp.

How many types of indicator solutions are mentioned in the script for the glucose test?

Three types of indicator solutions are mentioned: Fehling A, Fehling B, and Benedict solution.

What is the initial color of the carrot juice mentioned in the script?

The initial color of the carrot juice is orange.

What is the initial color of the milk in the glucose test?

The initial color of the milk is white.

What is the expected final color change for the glucose test if glucose is present?

If glucose is present, the expected final color change is a red precipitate at the bottom of the reaction tube.

How long should the reaction tubes be heated in the glucose test?

The reaction tubes should be heated for approximately 5 minutes.

What does the absence of a precipitate in the lemon water indicate in the glucose test?

The absence of a precipitate in the lemon water indicates that it does not contain glucose.

Based on the script, which of the tested samples contain glucose?

Based on the script, the samples that contain glucose are carrot juice, milk, sugar water, and tomato juice.

What is the conclusion of the glucose test as per the script?

The conclusion of the glucose test is that carrot juice, milk, sugar water, and tomato juice contain glucose, while lemon water does not.