Problem Overview:
The task is to classify the given substances as either
acids or
bases based on their pH values. The provided pH scale in the image shows the relative acidity or basicity of common household items, with pure water at a pH of 7 (neutral). Substances with a pH below 7 are acids, and those above 7 are bases.
Solution Approach:
1.
Understand the pH Scale:
- Acids: pH < 7
- Neutral: pH = 7
- Bases: pH > 7
2.
Use Analogies and Common Knowledge:
- Compare the given substances to the ones listed in the pH scale for hints about their acidity or basicity.
- Use general knowledge about the substances' properties (e.g., taste, use).
3.
Classify Each Substance:
- For each substance, determine whether it is more acidic or basic based on its known properties or analogies to similar substances.
---
Entry Level Question:
#### Substances to Classify:
1.
Sparkling water
- Sparkling water is slightly acidic due to the presence of carbonic acid formed from dissolved carbon dioxide.
-
Classification: Acid
2.
Orange
- Oranges are citrus fruits, which are known to be acidic.
-
Classification: Acid
3.
Dishwater liquid
- Dishwashing liquids are typically formulated to be basic to help break down grease and oils.
-
Classification: Base
4.
Toothpaste
- Toothpaste is designed to neutralize acids in the mouth and protect teeth, so it is usually basic.
-
Classification: Base
5.
Laundry soap
- Laundry detergents are generally basic to help remove dirt and stains effectively.
-
Classification: Base
6.
Ketchup
- Ketchup contains vinegar (acetic acid) and tomatoes, both of which are acidic.
-
Classification: Acid
7.
Baking soda
- Baking soda is sodium bicarbonate, a well-known base.
-
Classification: Base
---
More Challenging Question:
#### Substances to Classify:
1.
Coffee
- Coffee is mildly acidic due to the presence of compounds like chlorogenic acid.
-
Classification: Acid
2.
Spinach
- Spinach is slightly acidic, though not extremely so.
-
Classification: Acid
3.
Broccoli
- Broccoli is mildly acidic, similar to many vegetables.
-
Classification: Acid
4.
Cayenne pepper
- Cayenne pepper is slightly acidic due to its chemical composition.
-
Classification: Acid
---
Final Answer:
#### Entry Level Question:
- Sparkling water:
Acid
- Orange:
Acid
- Dishwater liquid:
Base
- Toothpaste:
Base
- Laundry soap:
Base
- Ketchup:
Acid
- Baking soda:
Base
#### More Challenging Question:
- Coffee:
Acid
- Spinach:
Acid
- Broccoli:
Acid
- Cayenne pepper:
Acid
Boxed Final Answer:
\[
\boxed{
\begin{array}{ll}
\text{Entry Level:} & \text{More Challenging:} \\
\text{Sparkling water: Acid} & \text{Coffee: Acid} \\
\text{Orange: Acid} & \text{Spinach: Acid} \\
\text{Dishwater liquid: Base} & \text{Broccoli: Acid} \\
\text{Toothpaste: Base} & \text{Cayenne pepper: Acid} \\
\text{Laundry soap: Base} & \\
\text{Ketchup: Acid} & \\
\text{Baking soda: Base} & \\
\end{array}
}
\]
Parent Tip: Review the logic above to help your child master the concept of acid bases worksheet.
