Give one characteristic property of all acids.

Explanation

### Step-by-Step Solution:

1. **Understanding Acids**: Acids are substances that can donate protons (H⁺ ions) in a solution. They have distinct properties that set them apart from other substances.

2. **Identifying Characteristic Properties**: There are several properties that are characteristic of acids. These include:
- Sour taste
- Reactivity with metals to produce hydrogen gas
- Reactivity with bases to form salt and water
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