1. What is the OH- Concentration Formula?

The OH- concentration formula calculates the hydroxide ion concentration from pOH using the relationship [OH⁻] = 10^(-pOH). This is fundamental in acid-base chemistry for determining basicity.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( [OH^-] \) — Hydroxide ion concentration (mol/L)
• \( pOH \) — Negative logarithm of hydroxide ion concentration (unitless)

Explanation: The formula converts the logarithmic pOH scale to the actual hydroxide ion concentration in moles per liter.

3. Importance of OH- Calculation

Details: Calculating hydroxide ion concentration is essential for determining solution basicity, pH calculations (since pH + pOH = 14), and understanding chemical equilibrium in aqueous solutions.

4. Using the Calculator

Tips: Enter pOH value (unitless). The value can be any real number, though typical pOH values range from 0 to 14 for aqueous solutions.

5. Frequently Asked Questions (FAQ)

Q1: What is the relationship between pH and pOH?
A: In aqueous solutions at 25°C, pH + pOH = 14. This relationship allows conversion between hydrogen ion and hydroxide ion concentrations.

Q2: What does a pOH value of 7 indicate?
A: A pOH of 7 indicates a neutral solution where [OH⁻] = 10⁻⁷ mol/L, which corresponds to pH = 7.

Q3: How is pOH related to basicity?
A: Lower pOH values indicate higher hydroxide ion concentrations and greater basicity, while higher pOH values indicate lower basicity.

Q4: Can pOH be negative?
A: Yes, pOH can be negative for very concentrated basic solutions where [OH⁻] > 1 mol/L, though this is uncommon in most applications.

Q5: What are typical [OH⁻] values for common solutions?
A: Neutral water: 10⁻⁷ mol/L, household ammonia: ~10⁻³ mol/L, sodium hydroxide solution (0.1 M): 0.1 mol/L.