Home
Back
pH Calculation Formula:
| From: | To: |
The pH calculation for sodium hydroxide (NaOH) solutions is based on the strong base dissociation in water. Since NaOH completely dissociates, the pH can be directly calculated from the hydroxide ion concentration using the formula pH = 14 + log C.
The calculator uses the pH formula for strong bases:
Where:
Explanation: The formula calculates pH by first determining the pOH (-log[OH⁻]) and then using the relationship pH = 14 - pOH, which simplifies to pH = 14 + log C for strong bases.
Details: Accurate pH calculation is essential for chemical reactions, biological systems, industrial processes, and laboratory experiments involving sodium hydroxide solutions.
Tips: Enter the concentration of NaOH solution in mol/L. The value must be greater than 0. The calculator will compute the corresponding pH value.
Q1: Why is NaOH considered a strong base?
A: NaOH completely dissociates in water, producing hydroxide ions (OH⁻) and sodium ions (Na⁺), making it a strong base.
Q2: What is the pH range for NaOH solutions?
A: The pH of NaOH solutions typically ranges from 7 to 14, depending on the concentration. Higher concentrations result in higher pH values.
Q3: Can this formula be used for other strong bases?
A: Yes, the formula pH = 14 + log C applies to any strong base that completely dissociates in water, such as KOH or LiOH.
Q4: What are the limitations of this calculation?
A: This calculation assumes ideal conditions and complete dissociation. It may not be accurate for very high concentrations where ionic strength effects become significant.
Q5: How does temperature affect pH calculations?
A: Temperature affects the dissociation constant of water (Kw), which changes the pH scale. The formula pH = 14 + log C is valid at 25°C where Kw = 10⁻¹⁴.