1. What is Molarity?

Molarity (M) is a measure of the concentration of a solute in a solution, defined as the number of moles of solute per liter of solution. For NaOH solutions, it represents the number of moles of sodium hydroxide dissolved in one liter of solution.

2. How Does the Calculator Work?

The calculator uses the molarity formula:

Where:

• \( M \) — Molarity (mol/L)
• \( m \) — Mass of NaOH (g)
• \( 40 \) — Molecular weight of NaOH (g/mol)
• \( V \) — Volume of solution (L)

Explanation: The formula calculates the number of moles of NaOH (mass divided by molecular weight) and divides by the volume in liters to obtain molar concentration.

3. Importance of Molarity Calculation

Details: Accurate molarity calculation is essential for preparing standard solutions, conducting titrations, and performing quantitative chemical analyses. NaOH solutions are widely used in acid-base titrations and various industrial processes.

4. Using the Calculator

Tips: Enter the mass of NaOH in grams and the volume of solution in liters. Ensure both values are positive numbers. The calculator will compute the molarity in moles per liter (mol/L).

5. Frequently Asked Questions (FAQ)

Q1: Why is the molecular weight of NaOH 40 g/mol?
A: NaOH has atomic masses: Na (23 g/mol) + O (16 g/mol) + H (1 g/mol) = 40 g/mol.

Q2: Can I use different units for volume?
A: The calculator requires liters. Convert milliliters to liters by dividing by 1000 (1 mL = 0.001 L).

Q3: What is a typical molarity range for NaOH solutions?
A: Common concentrations range from 0.1 M to 1.0 M for laboratory use, though specific applications may require different concentrations.

Q4: How should NaOH be handled safely?
A: NaOH is corrosive. Wear appropriate PPE (gloves, goggles) and handle with care to avoid skin contact or inhalation.

Q5: Does temperature affect molarity calculations?
A: While the calculation itself is temperature-independent, volume measurements should be made at standard temperature (usually 20°C) for highest accuracy.