1. What is pH to OH⁻ Conversion?

The pH to OH⁻ conversion calculates the hydroxide ion concentration in water based on the pH value. This relationship is fundamental in acid-base chemistry and water quality analysis.

2. How Does the Calculator Work?

The calculator uses the conversion formula:

Where:

• \( pH \) — pH value (0-14 scale)
• \( [OH^-] \) — Hydroxide ion concentration in moles per liter (M)

Explanation: This formula derives from the water ion product constant Kw = [H⁺][OH⁻] = 10⁻¹⁴ at 25°C, where pH = -log[H⁺].

3. Importance of OH⁻ Calculation

Details: Calculating hydroxide ion concentration is essential for understanding basic solutions, chemical reactions, water treatment processes, and environmental monitoring.

4. Using the Calculator

Tips: Enter pH value between 0 and 14. The calculator will compute the corresponding hydroxide ion concentration in molar units (M).

5. Frequently Asked Questions (FAQ)

Q1: What is the relationship between pH and pOH?
A: pH + pOH = 14 at 25°C. pOH = -log[OH⁻], so [OH⁻] = 10^(-pOH) = 10^(-(14-pH)).

Q2: What are typical [OH⁻] values for different pH levels?
A: At pH 7 (neutral), [OH⁻] = 10⁻⁷ M. At pH 14 (strong base), [OH⁻] = 1 M. At pH 0 (strong acid), [OH⁻] = 10⁻¹⁴ M.

Q3: Does temperature affect this calculation?
A: Yes, the water ion product Kw changes with temperature. This calculator assumes standard conditions of 25°C where Kw = 10⁻¹⁴.

Q4: Can this be used for non-aqueous solutions?
A: No, this formula is specific for aqueous solutions at 25°C. Different solvents have different ion product constants.

Q5: How precise are the results?
A: The results are mathematically precise based on the input pH value. However, actual experimental measurements may have some error.