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0.1 N NaOH

This document provides a detailed guide for preparing a 0.1 N NaOH solution, including the necessary calculations, apparatus, and procedure. It emphasizes the importance of safety precautions and proper storage to maintain the solution's concentration. Additionally, it suggests standardizing the solution before use for accuracy.

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660 views1 page

0.1 N NaOH

This document provides a detailed guide for preparing a 0.1 N NaOH solution, including the necessary calculations, apparatus, and procedure. It emphasizes the importance of safety precautions and proper storage to maintain the solution's concentration. Additionally, it suggests standardizing the solution before use for accuracy.

Uploaded by

Kb
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Here's a comprehensive guide on the preparation of 0.

1 N NaOH solution:
Aim:
To prepare 0.1 N NaOH solution.
Theory:
● Normality (N): Number of gram equivalents of a solute present in one liter of solution.
● Equivalent weight: Molecular weight of a substance divided by its valency.
● NaOH is a monobasic base: It releases one OH- ion per molecule.
Apparatus and Reagents:
● Analytical balance
● Weighing paper
● Spatula
● 1000 mL volumetric flask
● Distilled water
● Sodium hydroxide pellets (NaOH)
Procedure:
1. Calculation:
○ The molecular weight of NaOH is 40 g/mol.
○ Since NaOH is a monobasic base, its equivalent weight is also 40 g/equivalent.
○ To prepare 1000 mL of 0.1 N NaOH solution, we need:
Mass of NaOH = Normality × Equivalent weight × Volume (in L)

Mass of NaOH = 0.1 N × 40 g/equivalent × 1 L = 4 g

2. Preparation:
○ Weigh out 4 g of NaOH pellets on a weighing paper using an analytical balance.
○ Add about 500 mL of distilled water to a 1000 mL volumetric flask.
○ Carefully add the weighed NaOH pellets to the flask, stirring continuously to
dissolve them completely.
○ Once the NaOH is completely dissolved, add more distilled water to the flask until
the solution reaches the 1000 mL mark.
○ Stopper the flask and invert it several times to ensure thorough mixing.
Precautions:
● Always add NaOH to water, not water to NaOH, to avoid splashing and heat generation.
● Wear gloves and eye protection when handling NaOH.
● Work in a well-ventilated area.
Additional Considerations:
● The NaOH solution should be stored in a tightly stoppered, air-tight container to prevent
absorption of CO2 from the atmosphere, which would affect its concentration.
● The prepared NaOH solution should be standardized before use by titrating it against a
primary standard like potassium hydrogen phthalate (KHP).
By following these steps and precautions, you can accurately prepare a 0.1 N NaOH solution.

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