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 that:
- Substances with a pH below 7 are acids.
- Substances with a pH above 7 are bases.
- Substances with a pH of 7 are neutral.
We will use this information to classify the substances listed in the "Entry Level Question" and the "More Challenging" section.
---
Solution:
####
Entry Level Question:
1.
Sparkling water:
- Sparkling water is slightly acidic due to the presence of carbonic acid (formed when CO₂ dissolves in water).
-
Classification: Acid
2.
Orange:
- Oranges contain citric acid, which makes them acidic.
-
Classification: Acid
3.
Dishwater liquid:
- Dishwashing liquids are typically basic to help break down grease and oils.
-
Classification: Base
4.
Toothpaste:
- Toothpaste often contains baking soda or other alkaline ingredients to neutralize acids in the mouth.
-
Classification: Base
5.
Laundry soap:
- Laundry detergents are usually basic to help remove stains and dirt effectively.
-
Classification: Base
6.
Ketchup:
- Ketchup contains vinegar (acetic acid) and tomatoes (which are slightly acidic), making it acidic.
-
Classification: Acid
7.
Baking soda:
- Baking soda is a base with a pH around 8–9.
-
Classification: Base
---
####
More Challenging:
1.
Coffee:
- Coffee is mildly acidic due to compounds like chlorogenic acid and quinic acid.
-
Classification: Acid
2.
Spinach:
- Spinach is slightly acidic due to its natural organic acids.
-
Classification: Acid
3.
Broccoli:
- Broccoli is slightly acidic due to its natural organic acids.
-
Classification: Acid
4.
Cayenne pepper:
- Cayenne pepper is slightly acidic due to the presence of capsaicin and other compounds.
-
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:
- Coffee:
Acid
- Spinach:
Acid
- Broccoli:
Acid
- Cayenne pepper:
Acid
Boxed Final Answer:
\[
\boxed{
\begin{array}{ll}
\text{Sparkling water: Acid} & \text{Toothpaste: Base} \\
\text{Orange: Acid} & \text{Laundry soap: Base} \\
\text{Dishwater liquid: Base} & \text{Ketchup: Acid} \\
\text{Baking soda: Base} & \\
\text{Coffee: Acid} & \text{Spinach: Acid} \\
\text{Broccoli: Acid} & \text{Cayenne pepper: Acid} \\
\end{array}
}
\]
Parent Tip: Review the logic above to help your child master the concept of acid base worksheet high school.
