Which solutions has the highest pH value

Options

A. 1M KOH
B. `1M H_(2)SO_(4)`
C. Chlorine water
D. Water containing carbon dioxide

Explanation

To determine which solution has the highest pH value, we need to understand the pH scale and the nature of the solutions provided. Here’s a step-by-step solution:

### Step-by-Step Solution:

1. **Understanding pH Scale**:
- The pH scale ranges from 0 to 14.
- A pH of 7 is considered neutral (pure water).
- pH values less than 7 indicate acidic solutions.
- pH values greater than 7 indicate basic (alkaline) solutions.

2. **Identifying Acidic and Basic Solutions**:
- Acids have a pH less than 7. Examples include sulfuric acid (H₂SO₄) and hydrochloric acid (HCl).
- Bases have a pH greater than 7. For example, sodium hydroxide (NaOH) is a common base.

3. **Analyzing Given Solutions**:
- If the options include acids and at least one base, the base will have the highest pH.
- For instance:
- H₂SO₄ (sulfuric acid) has a pH < 7.
- HCl (from chlorine water) has a pH < 7.
- Water containing CO₂ forms carbonic acid (H₂CO₃), which also has a pH < 7.
- If there is a base (e.g., NaOH), it will have a pH > 7.

4. **Conclusion**:
- Since bases have pH values greater than 7, the solution that is a base will have the highest pH value compared to the acidic solutions.

### Final Answer:
The solution with the highest pH value is the one that is a base.