A solution has `pOH` equal to `13` at `298 K`. The solution will be

Options

A. Highly acidic
B. Highly basic
C. Moderatly basic
D. Unpredictable

Explanation

To determine the nature of the solution with a given pOH of 13 at 298 K, we can follow these steps:

### Step 1: Understand the relationship between pOH and pH
The relationship between pH and pOH at 298 K (25°C) is given by the equation:
\[ \text{pH} + \text{pOH} = 14 \]

### Step 2: Calculate the pH
Given that the pOH is 13, we can find the pH using the equation from Step 1:
\[ \text{pH} = 14 - \text{pOH} \]
\[ \text{pH} = 14 - 13 \]
\[ \text{pH} = 1 \]

### Step 3: Analyze the pH value
The pH scale ranges from 0 to 14:
- A pH of 7 is neutral.
- A pH less than 7 indicates an acidic solution.
- A pH greater than 7 indicates a basic solution.

Since we calculated a pH of 1, which is much lower than 7, this indicates that the solution is acidic.

### Step 4: Conclude the nature of the solution
Based on the pH value of 1, we can conclude that the solution is highly acidic.

### Final Answer
The solution is **highly acidic**.

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