Sodium Hydroxide Solution 500mL 0.1N Merck

A 0.1N (NaOH) Sodium Hydroxide Solution refers to a normality concentration of 0.1 N for sodium hydroxide in water. Normality (N) is a measure of concentration equivalent to molarity (M), but it takes into account the reactive capacity of the solute. For sodium hydroxide, which is a strong base and dissociates completely in water, 1 mole of NaOH provides 1 equivalent of hydroxide ions (OH⁻). Therefore, the molarity and normality of NaOH are numerically equal.

Concentration and Preparation of Sodium Hydroxide Solution 0.1N:

• 0.1 N NaOH means the solution contains 0.1 equivalents of NaOH per liter of solution.
• Since 1 N NaOH corresponds to 1 mole of NaOH per liter, a 0.1 N NaOH solution will have 0.1 moles of NaOH per liter.

To prepare 0.1 N NaOH:

• The molecular weight of NaOH: is 40 g/mol.
• The amount required for 1 liter of 0.1 N solution:$$\text{Amount of NaOH (g)}=\text{Normality (N)}\times \text{Equivalent weight of NaOH (g/equiv)}\times \text{Volume (L)}$$Since 1 mole of NaOH is 1 equivalent (because NaOH dissociates to give 1 OH⁻ ion), the equivalent weight of NaOH is 40 g/eq.So, for 1 liter of a 0.1 N NaOH solution:

  $$\text{Amount of NaOH}=0.1\times 40\times 1=4\text{ grams of NaOH}$$

• Steps for preparation:
  1. Weigh 4 grams of solid sodium hydroxide (NaOH).
  2. Add the NaOH to a beaker containing a small amount of distilled water.
  3. Stir the solution carefully to ensure the NaOH dissolves completely (NaOH is highly exothermic when dissolving in water, so do this slowly).
  4. Transfer the solution to a 1-liter volumetric flask, and dilute it with distilled water to the 1-liter mark.
  5. Mix thoroughly.

Usage of 0.1 N Sodium Hydroxide Solution:

A 0.1 N NaOH solution is commonly used in laboratory settings for:

• Titrations (such as acid-base titrations) to neutralize acids.
• Standardization of other solutions.
• Buffer solutions: To adjust pH in various chemical reactions and processes.

Safety Considerations:

• Corrosive: NaOH is caustic and can cause severe burns upon contact with skin or eyes.
• Handling: Always wear appropriate personal protective equipment (PPE), including gloves, goggles, and a lab coat.
• Storage: Store NaOH solution in tightly sealed containers to prevent absorption of CO₂ from the air, which can convert NaOH to sodium carbonate (Na₂CO₃).

Note on Normality vs Molarity:

For sodium hydroxide, normality (N) is the same as molarity (M) because each molecule of NaOH provides one hydroxide ion (OH⁻). Therefore, a 0.1 N NaOH solution also has a concentration of 0.1 M NaOH.

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