Procedure for preparation and standardization 1 N Sodium Hydroxide,

1. OBJECTIVE
To lay down the procedure for preparation and standardization of 1 N Sodium Hydroxide,

2. SCOPE
This procedure is applicable to Quality Control Department

3. RESPONSIBILITY
• Officer QC
• Manager QC

4. SAFETY INSTRUCTIONS
• Proper handling the apparatus.
• Proper handling the chemicals
• Always wear appropriate personal protective equipment when handling this chemical.
• Always handle NaOH with care and follow proper safety protocols. NaOH is a strong base and can cause chemical burns if it comes into contact with skin or eyes. It is also corrosive to many materials, so it should be stored in a tightly sealed container away from other chemicals.

5. PROCEDURE
5.1 PREPARATION
5.1.1 Determine the molecular weight of NaOH, which is 40 g/mol.
5.1.2 Calculate the number of moles of NaOH needed for a 1N solution. N represents the normality of the solution, which is defined as the number of equivalent weights of solute dissolved per liter of solution. For NaOH, the equivalent weight is 40 g/mol since NaOH is a monovalent base (able to donate one hydroxide ion per molecule). Therefore, to prepare a 1N solution, you need 40 grams of NaOH per liter of solution, or 1 mole of NaOH per liter of solution.
5.1.3 Weigh out 40 grams of NaOH using a scale.
5.1.4 Add distilled water to a volumetric flask to bring the volume up to 1 liter.
5.1.5 Carefully add the 40 grams of NaOH to the volumetric flask and stir until the NaOH dissolves completely.
5.1.6 Once the NaOH is completely dissolved, add more distilled water to bring the solution up to the mark on the volumetric flask, which indicates a total volume of 1 liter.
5.1.7 Mix the solution thoroughly to ensure that the NaOH is evenly distributed throughout the solution.
5.2 STANDARDIZATION
5.2.1 Accurately weigh about 5 g of potassium biphthalate, previously crushed lightly and dried at 120 for 2 hours, and dissolve in 75 mL of carbon dioxide-free water.
5.2.2 Add 2 drops of phenolphthalein TS, and titrate with the sodium hydroxide solution to the production of a permanent pink color. Each 204.2 mg of potassium biphthalate is equivalent to 1 mL of 1 N sodium hydroxide.
5.2.3 And calculate the normality by the following formula:

         g KHC₈H₄O₄
N= ——————————————————
         0.20423 x ml NaOH solution

6. RELATED DOCUMENTS
N/A

7. DISTRIBUTION INDEX
Original Copy will be retained by Quality Assurance Department.

8. ABBREVIATIONS
Q.C Quality Control Department
TS Test Solution
Gm Gram
ml Milliliter

9. REVISION HISTORY