Podcast
Questions and Answers
What is the colored part of the citrus peel called?
What is the colored part of the citrus peel called?
- Endocarp
- Albedo
- Mesocarp
- Flabelo (correct)
What is the main component of the mesocarp?
What is the main component of the mesocarp?
- Cellulose (correct)
- Fats
- Carbohydrates
- Proteins
What is the purpose of heating the sample in the titration process?
What is the purpose of heating the sample in the titration process?
- To create a chemical reaction
- To measure the pH
- To concentrate the sample
- To eliminate the antiferment (correct)
What is the equation used to calculate the acidity percentage?
What is the equation used to calculate the acidity percentage?
What is the equivalent of citric acid for 0.1N NaOH?
What is the equivalent of citric acid for 0.1N NaOH?
What is the edible part of the citrus fruit?
What is the edible part of the citrus fruit?
Why is it necessary to perform dilutions when expressing the results as citric acid hydrate?
Why is it necessary to perform dilutions when expressing the results as citric acid hydrate?
What is the purpose of the titration process?
What is the purpose of the titration process?
What are the indicative parameters of poor milk quality?
What are the indicative parameters of poor milk quality?
What is the purpose of the titrations in laboratory chemistry?
What is the purpose of the titrations in laboratory chemistry?
What is the normal value of protein in milk in Mexico?
What is the normal value of protein in milk in Mexico?
What is the pH range of fresh milk?
What is the pH range of fresh milk?
What is the function of fenolftaleÃna in the titration of milk?
What is the function of fenolftaleÃna in the titration of milk?
What are the main lipids present in emulsion in cow milk?
What are the main lipids present in emulsion in cow milk?
What is the term for the acidity of milk that is due to the presence of phosphates, proteins, citrates, and CO2?
What is the term for the acidity of milk that is due to the presence of phosphates, proteins, citrates, and CO2?
What is the primary purpose of analyzing milk quality?
What is the primary purpose of analyzing milk quality?
What can affect the quality of milk?
What can affect the quality of milk?
What is the term for the difference between the titrable acidity and the apparent acidity of milk?
What is the term for the difference between the titrable acidity and the apparent acidity of milk?
What is the minimum acidity percentage of milk that must be rejected after detecting its odor?
What is the minimum acidity percentage of milk that must be rejected after detecting its odor?
What is the main consequence of consuming poor-quality milk?
What is the main consequence of consuming poor-quality milk?
What is the primary component of milk?
What is the primary component of milk?
What is the characteristic smell of sour milk due to?
What is the characteristic smell of sour milk due to?
What is the purpose of milk emulsion?
What is the purpose of milk emulsion?
What is the purpose of the Universal Support in the laboratory setup?
What is the purpose of the Universal Support in the laboratory setup?
What is the purpose of determining the lactose percentage in milk?
What is the purpose of determining the lactose percentage in milk?
What is the name of the method used to determine the lactose percentage in milk?
What is the name of the method used to determine the lactose percentage in milk?
What is the concentration of acid benzoic in the solución acuosa used to prepare the lactose standard solution?
What is the concentration of acid benzoic in the solución acuosa used to prepare the lactose standard solution?
What is the volume of the volumetric flask used in the experiment?
What is the volume of the volumetric flask used in the experiment?
What is the purpose of the reactivo Fehling A and B?
What is the purpose of the reactivo Fehling A and B?
What is the type of lactose used to prepare the standard solution?
What is the type of lactose used to prepare the standard solution?
What is the indicator used in the titration process?
What is the indicator used in the titration process?
What is the amount of lactose anhydrate dissolved in 1 liter of solución acuosa to prepare the standard solution?
What is the amount of lactose anhydrate dissolved in 1 liter of solución acuosa to prepare the standard solution?
What is the objective of this laboratory practice?
What is the objective of this laboratory practice?
What is the name of the acid used in this laboratory practice?
What is the name of the acid used in this laboratory practice?
What is the role of starch in this laboratory practice?
What is the role of starch in this laboratory practice?
What is the function of Vitamin C in the human body?
What is the function of Vitamin C in the human body?
Which of the following is not a substance used in this laboratory practice?
Which of the following is not a substance used in this laboratory practice?
What is the purpose of using Potassium Iodide in this laboratory practice?
What is the purpose of using Potassium Iodide in this laboratory practice?
What is the concentration of Sulfuric acid used in this laboratory practice?
What is the concentration of Sulfuric acid used in this laboratory practice?
What type of fruits are used in this laboratory practice?
What type of fruits are used in this laboratory practice?
Study Notes
Acidity of Milk
- Milk is amphoteric, meaning it can exhibit both acidic and basic properties.
- Fresh milk has a pH of 6.5-6.7, making it slightly acidic.
- When titrated with an alkaline solution using phenolphthalein as an indicator, milk yields an average acidity of 0.14% expressed as lactic acid, known as apparent acidity.
- This acidity is due to the presence of phosphates, proteins, citrates, and CO2, not the lactic acid produced by microbial contamination.
- The difference between titratable acidity and apparent acidity is called real acidity.
- This test is valuable for classifying milk, and milk with acidity above 0.18% should be rejected.
Determination of Lactose
- The objective is to determine the percentage of lactose (disaccharide) in milk using the Fehling method.
- The reactants used are Fehling's A and B solutions.
- The procedure involves titrating a milk solution with the Fehling's solutions to determine the amount of lactose in grams equivalent to 1 ml of Fehling's solution.
Vitamin C Analysis
- Vitamin C is also known as ascorbic acid.
- It is an essential nutrient in the human diet and plays a crucial role in enzyme systems.
- Vitamin C is present in various foods, especially citrus fruits.
- The objective is to analyze the vitamin C content in citrus fruits using a semiquantitative method.
- The reaction between ascorbic acid and iodine is used, with starch as an indicator.
Laboratory Equipment and Materials
- The laboratory equipment used includes:
- Pipettes (10 ml, 25 ml)
- Burette
- Volumetric flask (100 ml)
- Erlenmeyer flask
- Measuring cylinder
- Stirring rod
- Bunsen burner
- The materials used include:
- Sodium hydroxide (0.1 N)
- Phenolphthalein (1%)
- Distilled water
- Milk and cream samples
- Lactose
- Fehling's A and B solutions
- Starch
- Iodine
- Potassium iodide
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Description
A laboratory experiment on acid-base titration, involving the use of burettes, pipettes, and reagents to determine the concentration of an acid or base in a solution. This quiz is based on the procedures and reactions in the lab.
