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 exclusive to one.

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

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

6. It tastes bitter.
→ Base
*Explanation:* Bases often have a bitter taste (though tasting chemicals is not safe!).

7. Conduct electricity
→ Both
*Explanation:* Both acids and bases can conduct electricity when dissolved in water because they produce ions (H⁺ for acids, OH⁻ for bases).

8. It turns litmus paper to red.
→ Acid
*Explanation:* Litmus paper turns red in the presence of an acid.

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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)

From the diagram:
- Coffee is shown at pH 5
- Water is at pH 7
- Vinegar is at pH 3
- Lemon is at pH 2
- Milk is at pH 6
- Blood is at pH 8
- Soap is at pH 11, etc.

9. What number is neutral?
→ 7
*Explanation:* pH 7 is neutral, like pure water.

10. In the pH scale, where does coffee fall to?
→ pH 5
*Explanation:* Coffee is slightly acidic, with a pH around 5.

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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. pH 5

Let me know if you'd like this formatted as a printable answer sheet!