1. What is NaOH Normality?

Normality (N) is a measure of concentration that represents the number of equivalents of a solute per liter of solution. For NaOH, which has one reactive hydroxide group, normality is equal to molarity.

2. How Does the Calculator Work?

The calculator uses the normality equation:

Where:

• \( mass \) — Mass of NaOH in grams
• \( 40 \) — Molar mass of NaOH (g/mol)
• \( volume \) — Total volume of solution in liters

Explanation: The equation calculates how many equivalents of NaOH are present per liter of solution.

3. Importance of Normality Calculation

Details: Knowing the normality of NaOH solutions is essential for accurate titrations, preparing standard solutions, and various chemical analyses in laboratories.

4. Using the Calculator

Tips: Enter the mass of NaOH in grams and the total volume of solution in liters. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why divide by 40 in the calculation?
A: 40 g/mol is the molar mass of NaOH (Na=23, O=16, H=1). This converts grams to moles.

Q2: What is the difference between normality and molarity?
A: For NaOH they are the same, but for compounds with multiple reactive groups, normality accounts for the number of reactive sites.

Q3: How should NaOH be weighed?
A: Use an analytical balance in a dry environment as NaOH is hygroscopic (absorbs moisture from air).

Q4: What are common normalities for NaOH solutions?
A: Common standard solutions are 0.1N, 0.5N, and 1.0N, depending on application.

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