Acids and bases worksheet 2 worksheet - Free Printable

Problem Analysis:

The task requires classifying the given substances as either acidic or basic and determining whether their pH is greater than 7 (basic) or less than 7 (acidic). The classification is based on general knowledge of acids and bases.

Solution:

#### Step 1: Understand the pH Scale
- Acids: Substances with a pH less than 7.
- Bases: Substances with a pH greater than 7.
- Neutral: Substances with a pH of 7.

#### Step 2: Classify Each Substance
We will classify each substance based on common knowledge about its acidity or basicity.

1. Fanta Orange
- Classification: Acidic
- pH: Less than 7
- Reason: Fanta Orange contains citric acid and other acidic ingredients, making it acidic.

2. Lux soap
- Classification: Basic
- pH: Greater than 7
- Reason: Soaps are generally basic to help neutralize acids on the skin.

3. Tap water
- Classification: Slightly acidic to neutral
- pH: Less than 7 (typically around 6.5–7.5)
- Reason: Tap water can vary slightly in pH but is generally close to neutral or slightly acidic.

4. Colgate toothpaste
- Classification: Basic
- pH: Greater than 7
- Reason: Toothpaste is formulated to be basic to neutralize the acids produced by bacteria in the mouth.

5. Handy Andy
- Classification: Basic
- pH: Greater than 7
- Reason: Handy Andy is a cleaning product that typically has a basic pH to remove grease and stains effectively.

6. Sunlight dishwashing liquid
- Classification: Basic
- pH: Greater than 7
- Reason: Dishwashing liquids are basic to help break down fats and oils.

7. Vitamin C
- Classification: Acidic
- pH: Less than 7
- Reason: Vitamin C is an organic acid (ascorbic acid).

8. Blood
- Classification: Slightly basic
- pH: Greater than 7 (around 7.35–7.45)
- Reason: Blood must maintain a slightly basic pH to ensure proper physiological functions.

9. Tartar sauce
- Classification: Acidic
- pH: Less than 7
- Reason: Tartar sauce often contains vinegar or lemon juice, which are acidic.

10. Baking powder
- Classification: Basic
- pH: Greater than 7
- Reason: Baking powder is a mixture of basic compounds (e.g., sodium bicarbonate) and acidic compounds, but overall it is basic.

#### Step 3: Fill in the Table
Using the classifications above, we can fill in the table:

| No. | SUBSTANCE | ACIDIC OR BASIC | pH |
|-----|------------------------|-----------------|----------|
| 1.1 | Fanta Orange | Acidic | pH < 7 |
| 1.2 | Lux soap | Basic | pH > 7 |
| 1.3 | tap water | Acidic | pH < 7 |
| 1.4 | Colgate toothpaste | Basic | pH > 7 |
| 1.5 | Handy Andy | Basic | pH > 7 |
| 1.6 | Sunlight dishwashing liquid | Basic | pH > 7 |
| 1.7 | Vitamin C | Acidic | pH < 7 |
| 1.8 | blood | Basic | pH > 7 |
| 1.9 | tartar sauce | Acidic | pH < 7 |
| 1.10| baking powder | Basic | pH > 7 |

Final Answer:

\[
\boxed{
\begin{array}{|c|l|c|c|}
\hline
\text{No.} & \text{SUBSTANCE} & \text{ACIDIC OR BASIC} & \text{pH} \\
\hline
1.1 & \text{Fanta Orange} & \text{Acidic} & \text{pH < 7} \\
1.2 & \text{Lux soap} & \text{Basic} & \text{pH > 7} \\
1.3 & \text{tap water} & \text{Acidic} & \text{pH < 7} \\
1.4 & \text{Colgate toothpaste} & \text{Basic} & \text{pH > 7} \\
1.5 & \text{Handy Andy} & \text{Basic} & \text{pH > 7} \\
1.6 & \text{Sunlight dishwashing liquid} & \text{Basic} & \text{pH > 7} \\
1.7 & \text{Vitamin C} & \text{Acidic} & \text{pH < 7} \\
1.8 & \text{blood} & \text{Basic} & \text{pH > 7} \\
1.9 & \text{tartar sauce} & \text{Acidic} & \text{pH < 7} \\
1.10 & \text{baking powder} & \text{Basic} & \text{pH > 7} \\
\hline
\end{array}
}
\]