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Lesson 7: Active Ingredients
Introduction:
Cleaning products contain various ingredients that help in removing dirt, germs, and stains. Understanding the active ingredients and their functions is important for using these products effectively and safely. This week, we will explore the common ingredients found in cleaning products and their purposes.
Objectives:
· Identify the active ingredient(s) of cleaning products from product labels.
· Give the use of the other ingredients in cleaning agents.
Active Ingredients in Cleaning Products:
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1. Surfactants: These are surface-active agents that lower the surface tension of water, allowing it to spread and penetrate better. Surfactants help in lifting dirt and stains from surfaces.
2. Bleaches: Bleaching agents like sodium hypochlorite (chlorine bleach) or hydrogen peroxide are used to whiten fabrics and remove stains by oxidizing them.
3. Acids: Acidic cleaners, such as vinegar or citric acid, are used to dissolve mineral deposits and soap scum.
4. Alkalis: Alkaline cleaners, like ammonia or sodium hydroxide, are used to break down grease and fats.
5. Enzymes: Enzymatic cleaners contain enzymes that break down protein-based stains like blood, urine, and food.
6. Solvents: Solvents like alcohol or glycol ethers help dissolve greasy or oily stains.
7. Fragrances: Fragrances are added to mask unpleasant odors and leave a pleasant scent after cleaning.
8. Preservatives: Preservatives are added to prevent the growth of bacteria and mold in the product.
9. Colorants: Colorants are added to give the product its color.
10. Thickeners: Thickeners are added to give the product its desired viscosity.
Use of Other Ingredients:
1. Water: Water is a solvent and a carrier for other ingredients in the cleaning product.
2. Builders: Builders like sodium carbonate or sodium citrate help to soften water and enhance the cleaning efficiency of other ingredients.
3. Chelating Agents: Chelating agents like EDTA are added to bind metal ions in water, preventing them from interfering with the cleaning process.
4. pH Adjusters: pH adjusters are added to maintain the optimal pH for the cleaning agents to work effectively.
Innovative Lab Activity: The Process of Making Soap
Objective:
To understand and simulate the saponification process
Materials:
Measuring cylinders
Common salt
Glass beakers
Coconut oil
20% NaOH solution
Bunsen burner
Glass rod
Funnel
Filter paper
Wire gauze
Tripod stand
Clamp stand
Red and blue litmus paper
Mobile phone (to view the YouTube video)
Procedure:
Measure 25 ml of coconut oil and 30 ml of 20% NaOH solution using measuring cylinders.
Pour the coconut oil into a beaker.
Add the NaOH solution to the beaker and stir vigorously with a glass rod.
Touch the beaker to feel the warmth from the exothermic reaction.
Place the beaker on a Bunsen burner and heat until the mixture becomes a whitish paste.
Remove the beaker from the flame and let it cool.
Test the suspension with red and blue litmus paper.
Add 15 g of common salt and stir well to precipitate the soap.
Filter the mixture through a funnel with filter paper.
Collect the soap on the filter paper, press to dry, and cut into desired shapes.
Guide Questions:
What observable change indicates the exothermic nature of the reaction between coconut oil and NaOH?
Why is common salt added to the mixture, and what effect does it have on the soap suspension?
How does the litmus paper test confirm the basic nature of the soap suspension?
Evaluation:
Direction: Choose the best correct answer and write it on the space before the number.
1.What is the purpose of surfactants in cleaning products?
A) To dissolve grease and fats
B) To soften water
C) To whiten fabrics
D) To lower the surface tension of water
Answer: D) To lower the surface tension of water
2.Which of the following is a common bleach used in cleaning products?
A) Vinegar
B) Ammonia
C) Sodium hypochlorite
D) Citric acid
Answer: C) Sodium hypochlorite
3.Why are preservatives added to cleaning products?
A) To mask unpleasant odors
B) To prevent the growth of bacteria and mold
C) To dissolve mineral deposits
D) To enhance the cleaning efficiency
Answer: B) To prevent the growth of bacteria and mold
4.What is the purpose of chelating agents in cleaning products?
A) To lower the surface tension of water
B) To bind metal ions in water
C) To break down protein-based stains
D) To dissolve greasy or oily stains
Answer: B) To bind metal ions in water
5.What is the role of pH adjusters in cleaning products?
A) To soften water
B) To maintain the optimal pH for cleaning agents
C) To prevent the growth of bacteria and mold
D) To enhance the cleaning efficiency
Answer: B) To maintain the optimal pH for cleaning agents
References
Toth, J., & Ye, Z. (2013). Green Cleaning For Dummies. John Wiley & Sons.
Ophardt, C. E. (2003). Cleaning Agents and Surface Treatments. Virtual
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