[ANALISIS PANGAN] - MATERI I - Kadar Air Metode Gravimetri

Summary

The video script describes a detailed laboratory procedure for determining the moisture content in a sample. It outlines the steps of drying a sample in a drying oven at 105°C, cooling it in open air, and placing it in an exicator to achieve a constant weight. The process is repeated to ensure accuracy, with the final weight measurements used to calculate the moisture content. The transcript also mentions practical data collection and calculations, showcasing the technical steps involved in conducting this experiment.

Takeaways

• 😀 The process begins with drying an evaporating dish in an oven at 105°C for 30 minutes.
• 😀 After drying, the dish is left in open air for 5 minutes and then placed in a desiccator for 10 minutes.
• 😀 The dish is weighed after each step, and the process is repeated until a constant weight is achieved.
• 😀 Once a constant weight of the evaporating dish is reached, 1 to 2 grams of the sample are weighed for drying.
• 😀 The sample is dried in the oven at 105°C for 2 hours.
• 😀 After drying, the sample is left in open air for 5 minutes before being placed in the desiccator for 10 minutes.
• 😀 The sample is weighed after being removed from the desiccator, and the drying process is repeated until the weight is constant.
• 😀 The process ensures accurate drying and weighing to eliminate moisture content in the sample.
• 😀 The final weight of the dish and sample is used to calculate the moisture content of the sample.
• 😀 The script also includes references to specific steps such as drying, cooling, and weighing to ensure precision in the results.
• 😀 The data collected from the experiment is used to calculate the moisture content, ensuring a reliable result.

Q & A

What is the initial step in the sample drying process?

The initial step is to preheat the evaporating dish in an oven at 105°C for 30 minutes to achieve a constant weight.

Why is the evaporating dish allowed to cool in open air before being placed in the desiccator?

The dish is allowed to cool in open air for 5 minutes to prevent moisture from entering the dish due to temperature differences before being placed in the desiccator.

How long should the evaporating dish be kept in the desiccator?

The evaporating dish should be kept in the desiccator for 10 minutes after cooling in open air.

What is the purpose of repeating the process of weighing the evaporating dish?

The process is repeated until a constant weight of the evaporating dish is achieved, ensuring accurate measurements for subsequent steps.

What is the next step after obtaining the constant weight of the evaporating dish?

Once the constant weight of the evaporating dish is obtained, 1 to 2 grams of the sample are weighed and placed into the dish for drying.

What is the drying temperature and duration for the sample?

The sample is dried in an oven at 105°C for 2 hours.

What happens to the sample after it is removed from the oven?

After being removed from the oven, the sample is left to cool in open air for 5 minutes before being placed in the desiccator.

Why is the sample placed in the desiccator after drying?

The sample is placed in the desiccator to allow it to cool in a moisture-free environment, preventing it from absorbing ambient humidity.

How is the process repeated until constant weight is achieved?

The process of drying, cooling, and weighing is repeated until the weight of the sample and the evaporating dish becomes constant, indicating that all moisture has been removed.

What is the final step in the procedure?

The final step is to calculate the moisture content of the sample using the weight measurements of the evaporating dish and the sample.