1. What is Sodium Hydroxide Concentration?

Sodium hydroxide (NaOH) concentration can be expressed as percentage (weight/volume) or molarity (moles per liter). It's a crucial measurement in chemical preparations, titrations, and industrial processes.

2. How Does the Calculator Work?

The calculator uses two formulas based on your selection:

Where:

• \( C \) — Concentration (percentage or mol/L)
• \( \text{mass} \) — Mass of NaOH in grams
• \( \text{moles} \) — Moles of NaOH
• \( \text{volume} \) — Volume of solution in liters

3. Importance of NaOH Concentration

Details: Accurate NaOH concentration is essential for chemical reactions, pH adjustment, cleaning solutions, and industrial processes like soap making and paper production.

4. Using the Calculator

Tips: Select calculation type (percentage or molarity), enter the appropriate values (mass for percentage, moles for molarity), and volume in liters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between percentage and molarity?
A: Percentage is weight/volume (grams per 100 mL), while molarity is moles per liter (mol/L), which accounts for molecular weight.

Q2: How do I convert between percentage and molarity?
A: For NaOH: Molarity = (Percentage × 10) / 40 (since NaOH molecular weight is ~40 g/mol)

Q3: What's a common NaOH concentration for lab use?
A: Common stock solutions are 1M, 0.1M, or 10% (w/v), but always check requirements for your specific application.

Q4: Why is NaOH concentration important in titrations?
A: Precise concentration ensures accurate determination of unknown acid concentrations in acid-base titrations.

Q5: How should NaOH solutions be stored?
A: In airtight plastic containers (not glass) to prevent absorption of CO₂ from air which affects concentration.