How do you prepare and standardize NaOH for 1M?

Sodium Hydroxide (1M)

Molecular formula: NaOH 

Molecular weight: 40 

Preparation: Dissolve 40 g of sodium hydroxide in sufficient carbon dioxide-free water to produce 1000 mL. Prepared solution stored in bottles with well-fitted suitable stoppers which prevent access to atmospheric carbon dioxide. 

Standardization: Weigh accurately about 5 g of potassium hydrogen phthalate, previously powdered and dried at 120°C for 2 hours, and dissolve in 75 mL of carbon dioxide-free water.  Add 0.1 mL of phenolphthalein solution and titrate with the sodium hydroxide solution until a permanent pink color is produced. Volumetric solutions of sodium hydroxide must be restandardise frequently.

Reaction:

Factor Calculation: 

1 mole of NaOH ≅ 1 mole of potassium hydrogen phthalate 

1000 mL of 1M NaOH ≅ 204.2 g of C₈H₅KO₄ 

1 mL of 1 M NaOH ≅ 0.2042 g of C₈H₅KO₄

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