Acids and Bases Worksheets | Uses of Acids and Bases, Fun Facts - Free Printable

Let's solve this pH Levels worksheet step by step. The goal is to:

1. Understand the pH scale.
2. Identify whether each substance is acidic, neutral, or basic.
3. Place each substance on the correct color level of the pH scale based on its typical pH value.

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🔬 Step 1: Understanding the pH Scale

The pH scale ranges from 0 to 14, where:
- 0–6: Acidic (red to yellow)
- 7: Neutral (green)
- 8–14: Basic (alkaline) (blue to purple)

The colors on the scale go from:
- Red (most acidic) → Orange/Yellow → Green (neutral) → Blue/Purple (most basic)

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🧪 Step 2: Typical pH Values of Each Substance

Here are the approximate pH values for each item listed:

| Substance | Approximate pH | Classification |
|-------------------|----------------|----------------|
| Blood | 7.35–7.45 | Slightly Basic |
| Lemon | 2.0–2.5 | Acidic |
| Gastric Acid | 1.5–3.5 | Strongly Acidic |
| Tomato | 4.0–4.5 | Acidic |
| Coffee | 5.0–5.5 | Slightly Acidic |
| Ammonia Acid | ~9.0–11.0 | Basic |
| Bleach | 12.0–13.0 | Strongly Basic |
| Battery Acid | ~0.8–1.0 | Strongly Acidic |
| Soda (soft drink) | 2.5–3.5 | Acidic |
| Soap | 9.0–10.0 | Basic |
| Water | 7.0 | Neutral |
| Drain Cleaner | 13.0–14.0 | Strongly Basic |
| Milk | 6.5–6.7 | Slightly Acidic |
| Stomach Tablets | ~8.0–9.0 | Basic |
| Baking Soda | 8.0–9.0 | Basic |

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🎯 Step 3: Assigning Items to the pH Scale

We’ll now assign each item to the appropriate color band on the scale.

#### 🔴 Highly Acidic (pH 0–3) – Red to Orange
- Battery Acid (pH ~0.8–1.0) → Top red/orange
- Gastric Acid (pH 1.5–3.5) → Red/Orange
- Lemon (pH 2.0–2.5) → Orange
- Soda (pH 2.5–3.5) → Orange

#### 🟡 Moderately Acidic (pH 4–6) – Yellow to Light Green
- Tomato (pH 4.0–4.5) → Yellow
- Coffee (pH 5.0–5.5) → Light Yellow/Green
- Milk (pH 6.5–6.7) → Light Green

#### 🟢 Neutral (pH 7) – Middle Green
- Water (pH 7.0) → Middle green

#### 🔵 Basic (pH 8–11) – Blue to Teal
- Blood (pH 7.35–7.45) → Light Blue (slightly above neutral)
- Ammonia (pH ~9–11) → Teal/Blue
- Soap (pH 9–10) → Blue
- Stomach Tablets (pH 8–9) → Blue
- Baking Soda (pH 8–9) → Blue

#### 💜 Strongly Basic (pH 12–14) – Dark Blue to Purple
- Bleach (pH 12–13) → Dark Blue
- Drain Cleaner (pH 13–14) → Purple

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✔ Final Answer: Where to Place Each Item

Now, label the scale accordingly:

#### Top (Red → Orange): Strong Acids
- Battery Acid (top red)
- Gastric Acid (just below)
- Lemon (orange)
- Soda (orange)

#### Middle Yellow → Light Green: Mild Acids & Neutral
- Tomato (yellow)
- Coffee (light yellow-green)
- Milk (light green)
- Water (middle green)

#### Blue → Purple: Bases
- Blood (light blue, just above 7)
- Ammonia (teal/blue)
- Soap (blue)
- Stomach Tablets (blue)
- Baking Soda (blue)
- Bleach (dark blue)
- Drain Cleaner (purple)

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🖼️ Instructions for Worksheet Completion

1. Label the pH scale at the top with numbers from 0 to 14, starting at the top (red = 0) and ending at the bottom (purple = 14).
2. Mark the zones:
- Acidic: 0–6 (Red to Yellow)
- Neutral: 7 (Green)
- Basic: 8–14 (Blue to Purple)
3. Cut out the pictures and glue them in the correct colored section based on their pH.
4. Optional: Write the name under each picture.

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📌 Summary Table for Placement

| Color Zone | pH Range | Items to Place Here |
|----------------|----------|--------------------------------------------------|
| Red / Orange | 0–3 | Battery Acid, Gastric Acid, Lemon, Soda |
| Yellow | 4–5 | Tomato, Coffee |
| Light Green | 6–7 | Milk, Water |
| Green | 7 | Water (exact neutral) |
| Blue | 8–11 | Blood, Ammonia, Soap, Stomach Tablets, Baking Soda |
| Dark Blue | 12–13 | Bleach |
| Purple | 13–14 | Drain Cleaner |

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✔ This completes the task! You can now cut out the images and place them correctly on the pH scale as per the instructions.

Let me know if you'd like a printable version or a labeled diagram!