How to Prepare 1N Sodium Hydroxide (NaOH) Solution

Rapidly weigh about 10 gm of sodium hydroxide in a small beaker and dissolve it in 50 ml of distilled water. Pour the content of the beaker into a 250-ml volumetric flask and make up the volume to the mark with distilled water. This is approximately 1(N) NaOH solution.

Standradizition of 1 n sodium hydroxide solution

Transfer 10 ml NaOH solution by a pipette to a 100-ml volumetric flask and make up the volume to the mark with distilled water. 

Take this solution in a burette. Pipette out 25 ml of standard 0.1(N) potassium hydrogen phthalate solution and transfer it into a 100-ml conical flask. 

Titrate with the NaOH solution using phenolphthalein or thymol blue as an indicator.
Normality is readily computed from the relation, V_a N_a  = V_b N_b.

Where Va and Na are the volume (in ml) taken and normality of the potassium hydrogen phthalate solution respectively,  V_b is the volume of NaOH solution in ml required for neutralization and N_b is the (unknown) normality of NaOH solution.
 
Strength of original NaOH solution  =  10 x 25 x 0.1 =    25
                                                                         V_b               V_b

PREPARATION OF 0.5(N) SODIUM HYDROXIDE (NaOH) SOLUTION.

Rapidly weigh about 5 gm of sodium hydroxide in a small beaker and dissolve it in 50 ml of distilled water. Pour the content of the beaker into a 250-ml volumetric flask and make up the volume to the mark with distilled water

STANDARDIZATION OF 1(N) SODIUM HYDROXIDE SOLUTION.

Strength of original NaOH solution  =  10 x 25 x 0.1      =    25

                                                                       V_b                      V_b

_FAQ

1. How Much NaOH is needed to prepare a 1N solution?

To prepare a 1N solution of NaOH, 40 grams of pure sodium hydroxide must be dissolved in enough distilled water to make the total volume 1 liter.

2. What Equipment is needed to prepare 1N NaOH solution?

• Analytical balance
• Beaker or glass container
• Stirring rod or magnetic stirrer
• Distilled water
• Volumetric flask (1 liter)
• Gloves and safety goggles

3. What is the step-by-step process for preparing 1N NaOH solution?

1. Weigh 40 grams of sodium hydroxide using an analytical balance.
2. Carefully add the NaOH to a beaker with about 500 mL of distilled water.
3. Stir the solution until the NaOH completely dissolves.
4. Transfer the solution to a 1-litre volumetric flask and add more distilled water until the total volume is 1 litre.

4. Why is it important to use distilled water in NaOH solution preparation?

Distilled water is free from impurities and ions that may interfere with the accuracy of NaOH solution. Using tap water may alter the concentration due to the presence of minerals and chemicals.

5. How should I store 1N sodium hydroxide solution?

Store the solution in a tightly sealed, labeled plastic or glass container. Sodium hydroxide can react with carbon dioxide from the air, so it's important to keep it well-sealed to maintain concentration.

6. What safety precautions should I take when preparing NaOH solution?

Sodium hydroxide is highly corrosive and can cause burns. Always wear protective gear like gloves and goggles. Work in a well-ventilated area and avoid contact with skin or eyes.

7. How long does a 1N NaOH solution remain stable?

Over time, NaOH solutions can absorb carbon dioxide from the air, forming sodium carbonate, which changes the concentration. To maintain accuracy, it’s best to store the solution in a sealed container and check periodically for changes in concentration.

8. Can I prepare smaller or larger volumes of 1N NaOH solution?

For example, to prepare 500 mL of 1N NaOH, dissolve 20 grams of NaOH in enough water to make 500 mL of solution.

9. What are some common applications of 1N NaOH solution?

The 1N NaOH is commonly used in titrations, pH adjustments, chemical synthesis, and as a cleaning agent in laboratories and industries.