Phenolphthalein is a/an ____ indicator

Answer

To answer the question "Phenolphthalein is a/an ____ indicator," we can follow these steps:

### Step 1: Understand what Phenolphthalein is
Phenolphthalein is a chemical compound commonly used as an indicator in titrations and other chemical reactions.

**Hint:** Remember that indicators are substances that change color in response to changes in pH.

### Step 2: Identify the type of indicator
Phenolphthalein is classified as a synthetic indicator. This means it is not derived from natural sources but is instead created through chemical processes.

**Hint:** Think about the difference between natural indicators (like litmus) and synthetic indicators.

### Step 3: Determine the behavior of Phenolphthalein in different pH environments
- In an acidic medium (pH < 7), Phenolphthalein is colorless.
- In a basic medium (pH > 7), it turns pink.

**Hint:** Consider how the color change of an indicator can help determine the acidity or basicity of a solution.

### Step 4: Conclude the type of indicator
Since Phenolphthalein changes color in response to basic conditions, it is specifically referred to as a "basic indicator."

**Hint:** Reflect on the pH range where Phenolphthalein changes color (from colorless to pink) to reinforce its classification.

### Final Answer
Phenolphthalein is a **synthetic basic indicator**.