1. What is the NaOH pH Calculation?

The NaOH pH calculation determines the pH value of a sodium hydroxide solution based on its concentration. As a strong base, NaOH completely dissociates in water, making the calculation straightforward using the formula pH = 14 + log C.

2. How Does the Calculator Work?

The calculator uses the strong base pH formula:

Where:

• \( C \) — Concentration of NaOH solution (mol/L)
• 14 — Represents the pKw of water at 25°C

Explanation: For strong bases like NaOH, the hydroxide ion concentration equals the base concentration. The pH is calculated from pOH (pOH = -log[OH⁻]) and the relationship pH = 14 - pOH.

3. Importance of pH Calculation

Details: Accurate pH calculation is essential for chemical reactions, industrial processes, laboratory experiments, and understanding solution properties. pH affects reaction rates, solubility, and biological systems.

4. Using the Calculator

Tips: Enter the NaOH concentration in mol/L. The value must be greater than 0. The calculator will compute the corresponding pH value.

5. Frequently Asked Questions (FAQ)

Q1: Why is the formula pH = 14 + log C for NaOH?
A: NaOH is a strong base that completely dissociates, so [OH⁻] = C. Since pOH = -log[OH⁻] and pH = 14 - pOH, we get pH = 14 + log C.

Q2: What is the pH range for NaOH solutions?
A: NaOH solutions typically have pH values above 7 (basic). Concentrated solutions (1M) have pH around 14, while dilute solutions have lower pH values.

Q3: Does temperature affect the calculation?
A: Yes, the pKw of water changes with temperature. This calculator uses the standard 25°C value of 14.

Q4: Can this calculator be used for other strong bases?
A: Yes, the same formula applies to other strong bases like KOH, but the concentration must represent the hydroxide ion concentration.

Q5: What are safety considerations when working with NaOH?
A: NaOH is corrosive and can cause severe burns. Always use appropriate protective equipment and handle with care.