Acids and Bases worksheet - Free Printable

Let's solve the problem step by step.

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Part 1: Identify the following properties as: acid, base, or both.

We'll go through each statement and determine whether it describes an acid, a base, or both.

1. It turns litmus paper to blue.
→ Base
*Explanation:* Litmus paper turns blue in the presence of a base.

2. It tastes sour.
→ Acid
*Explanation:* Acids typically have a sour taste (e.g., lemon juice).

3. Can be dissolved in water
→ Both
*Explanation:* Many acids and bases can dissolve in water. This is a general property of many substances, not specific to one.

4. It feels slippery
→ Base
*Explanation:* Bases often feel slippery or soapy to the touch (like soap).

5. It is usually found in citric juices and other food.
→ Acid
*Explanation:* Citric juices (like lemon, orange) contain citric acid — an acid.

6. It tastes bitter.
→ Base
*Explanation:* Bases often have a bitter taste (e.g., baking soda).

7. Conduct electricity
→ Both
*Explanation:* Both acids and bases conduct electricity when dissolved in water because they produce ions (electrolytes).

8. It turns litmus paper to red.
→ Acid
*Explanation:* Acids turn litmus paper red.

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Part 2: pH Scale Questions

Now, look at the pH scale provided:

- The scale ranges from 0 to 14.
- 0–6: Acidic
- 7: Neutral
- 8–14: Alkaline (basic)

The items are labeled:
- Battery (0), Lemon (2), Tomato (4), Milk (6), Blood (7), Stomach Tablets (9), Soap (11), Drain Cleaner (14)
- Stomach Acid (0), Vinegar (3), Coffee (5), Water (7), Baking Soda (9), Ammonia Solution (11), Bleach (13)

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9. What number is neutral?
→ 7
*Explanation:* On the pH scale, 7 is neutral (like pure water).

10. In the pH scale, where does coffee fall to?
→ 5
*Explanation:* According to the diagram, coffee is labeled at pH 5, which is acidic.

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✔ Final Answers:

1. Base
2. Acid
3. Both
4. Base
5. Acid
6. Base
7. Both
8. Acid
9. 7
10. 5

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