1. What is pH and pOH?

pH and pOH are measures of the acidity and basicity of a solution. pH is the negative logarithm of the hydrogen ion concentration, while pOH is the negative logarithm of the hydroxide ion concentration. In aqueous solutions at 25°C, they are related by the equation: pH + pOH = 14.

2. How Does the Calculator Work?

The calculator uses the fundamental relationship between pH and pOH:

Where:

• \( pH \) — Measure of acidity (0-14 scale)
• \( pOH \) — Measure of basicity (0-14 scale)

Explanation: If you know either pH or pOH, you can calculate the other value by subtracting from 14.

3. Importance of pH and pOH

Details: pH and pOH are crucial in chemistry, biology, medicine, and environmental science. They affect chemical reactions, biological processes, and the behavior of substances in solution.

4. Using the Calculator

Tips: Enter either pH or pOH value (0-14 range) and the calculator will compute the other value. You can only enter one value at a time for calculation.

5. Frequently Asked Questions (FAQ)

Q1: What does a pH of 7 mean?
A: A pH of 7 indicates a neutral solution (like pure water) at 25°C. pH values below 7 are acidic, while values above 7 are basic.

Q2: How are pH and pOH related to concentration?
A: pH = -log[H⁺] and pOH = -log[OH⁻], where [H⁺] is hydrogen ion concentration and [OH⁻] is hydroxide ion concentration.

Q3: Does temperature affect the pH-pOH relationship?
A: Yes, the sum pH + pOH equals pKw, which varies with temperature. At 25°C, pKw is 14, but this changes at other temperatures.

Q4: Can pH be negative or greater than 14?
A: Yes, for extremely concentrated acids (pH < 0) or bases (pH > 14), though such solutions are rarely encountered.

Q5: How is pH measured experimentally?
A: Typically with a pH meter or pH indicator papers/strips that change color based on pH.