Worksheet: Acid Base Properties Chart and Reactions | Exercises ... - Free Printable

Explanation:
We need to match each item to its approximate pH level and label it as acidic, neutral, or basic. The pH scale goes from 0 (very acidic) to 14 (very basic), with 7 being neutral.

Let’s go through each item one by one using common knowledge:

1. Blood – Slightly basic: pH ≈ 7.4 → basic
2. Lemon – Very sour, citric acid: pH ≈ 2–3 → acidic
3. Gastric Acid – Stomach acid is very strong: pH ≈ 1–2 → acidic
4. Tomato – Slightly acidic: pH ≈ 4–4.5 → acidic
5. Coffee – Mildly acidic: pH ≈ 5 → acidic
6. Ammonia – Cleaning product, basic: pH ≈ 11–12 → basic
7. Bleach – Strong base: pH ≈ 12–13 → basic
8. Battery acid – Sulfuric acid: pH ≈ 0–1 → acidic
9. Soda (cola) – Carbonated, phosphoric acid: pH ≈ 2.5–3.5 → acidic
10. Soap – Alkaline (basic): pH ≈ 9–10 → basic
11. Water – Pure water is neutral: pH = 7 → neutral
12. Drain Cleaner – Very strong base (e.g., NaOH): pH ≈ 13–14 → basic
13. Milk – Slightly acidic: pH ≈ 6.5–6.7 → acidic
14. Stomach Tablets (antacids like Tums) – Contain calcium carbonate; they neutralize acid → pH ≈ 8–10 → basic
15. Baking Soda (sodium bicarbonate) – Weak base: pH ≈ 8.3 → basic

Now, the color scale on the left (from top to bottom) likely corresponds to:
- Red/Orange → acidic (low pH)
- Yellow/Green → near neutral
- Blue/Purple → basic (high pH)

But the task only asks us to *label* each item as acidic, neutral, or basic — not to assign exact colors or positions unless instructed. Since the worksheet says “label the scale… and label the items”, and the final output expected is just the classification, we’ll list each item with its correct category.

Double-checking tricky ones:
- Milk: slightly acidic (yes, ~6.7 < 7)
- Water: neutral (only if pure; tap water may vary, but standard assumption is neutral)
- Stomach tablets: antacids are basic — correct
- Tomato & coffee: both acidic — correct

All classifications are consistent with standard science references.

Final Answer:
Blood: basic
Lemon: acidic
Gastric Acid: acidic
Tomato: acidic
Coffee: acidic
Ammonia: basic
Bleach: basic
Battery: acidic
Soda: acidic
Soap: basic
Water: neutral
Drain Cleaner: basic
Milk: acidic
Stomach Tablets: basic
Baking Soda: basic