0.1 N KOH Solution Preparation in 100 mL
Introduction
KOH (potassium hydroxide) is a strong base widely used in various industries, including pharmaceuticals, food, and chemicals. A 0.1 N KOH solution is a common concentration used in many laboratory applications. In this article, we will guide you through the preparation of a 0.1 N KOH solution in 100 mL.
Materials Needed
- KOH pellets (potassium hydroxide)
- Distilled water
- 100 mL volumetric flask
- Balance (optional)
Calculations
To prepare a 0.1 N KOH solution, we need to calculate the amount of KOH required. The normality (N) of a solution is defined as the number of gram equivalents per liter of solution. For KOH, the gram equivalent weight is 56.11 g/mol. Therefore, the amount of KOH required can be calculated as follows:
Molarity (M) = Normality (N) x Equivalent weight / Molecular weight M = 0.1 x 56.11 / 56.11 = 0.1 M
The molecular weight of KOH is 56.11 g/mol. To prepare 100 mL of 0.1 M KOH solution, we need:
Weight of KOH = Molarity x Molecular weight x Volume (in liters) = 0.1 x 56.11 x 0.1 L = 0.5611 g
Preparation
Step 1: Weigh the KOH Pellets
Using a balance, accurately weigh out 0.5611 g of KOH pellets.
Step 2: Add Distilled Water
Transfer the weighed KOH pellets to a 100 mL volumetric flask.
Step 3: Dissolve the KOH
Add a small amount of distilled water to the flask and stir until the KOH pellets are fully dissolved.
Step 4: Dilute to Mark
Add more distilled water to the flask until the volume reaches the 100 mL mark.
Step 5: Mix Well
Mix the solution well to ensure the KOH is fully dissolved and the solution is homogeneous.
Result
You have now prepared 100 mL of a 0.1 N KOH solution. This solution can be used for various laboratory applications, such as titrations, pH adjustments, and more.
Precautions
- Always handle KOH pellets with gloves and safety goggles to avoid skin and eye irritation.
- Keep the solution away from heat sources and flames, as it can ignite.
- Store the solution in a tightly sealed container and label it properly.
By following these steps and calculations, you can easily prepare a 0.1 N KOH solution in 100 mL. Remember to always exercise caution when handling strong bases like KOH.
