Which one is synthetic indicator for acidity and basicity?

Options

A. Litmus
B. Turmeric
C. Methyl orange
D. All of these

Explanation

To determine which one is a synthetic indicator for acidity and basicity, we need to analyze the options provided in the context of indicators.

### Step-by-Step Solution:

1. **Understanding Indicators**: Indicators are substances that change color in response to changes in pH, helping to identify whether a solution is acidic or basic.

2. **Types of Indicators**: There are two main types of indicators:
- **Natural Indicators**: These are derived from natural sources. Examples include turmeric and red cabbage.
- **Synthetic Indicators**: These are man-made and often provide clearer and more distinct color changes. Examples include litmus, methyl orange, and phenolphthalein.

3. **Analyzing the Options**:
- **Litmus**: This is a common synthetic indicator that changes color in acidic and basic environments.
- **Turmeric**: This is a natural indicator, which changes color in the presence of a base but does not indicate acidity effectively.
- **Methyl Orange**: This is a synthetic indicator that is frequently used in titrations and changes color distinctly in acidic and basic solutions.

4. **Conclusion**: Since the question specifically asks for synthetic indicators, both litmus and methyl orange qualify as synthetic indicators. Turmeric does not qualify as it is a natural indicator.

5. **Final Answer**: The synthetic indicators for acidity and basicity are **litmus and methyl orange**. If the question allows for multiple answers, then the answer could be "all of these" if it includes synthetic indicators only.