0.1 M KOH Solution Preparation
Introduction
Potassium hydroxide (KOH) is a strong base widely used in various laboratory applications, including titration, pH adjustment, and cleaning. To prepare a 0.1 M KOH solution, it is essential to follow a standardized protocol to ensure accuracy and precision.
Materials
- Potassium hydroxide (KOH) pellets or powder
- Distilled water
- 100 mL volumetric flask
- Balance
- Stirring rod
Procedure
Step 1: Calculate the Amount of KOH Required
To prepare 100 mL of 0.1 M KOH solution, calculate the amount of KOH required using the following formula:
Molarity (M) = Number of moles of solute / Liters of solution M = moles / L
For 0.1 M KOH solution: M = 0.1 mol/L Molecular weight of KOH = 56.11 g/mol
Number of moles = Molarity x Volume (L) = 0.1 mol/L x 0.1 L = 0.01 mol
Weight of KOH = Number of moles x Molecular weight = 0.01 mol x 56.11 g/mol = 0.5611 g
Step 2: Weigh the KOH
Using a balance, accurately weigh 0.5611 g of potassium hydroxide pellets or powder.
Step 3: Prepare the Solution
Transfer the weighed KOH to a 100 mL volumetric flask. Add a small amount of distilled water to the flask and dissolve the KOH by stirring with a glass rod. Once the KOH is completely dissolved, add more distilled water to the flask until the 100 mL mark.
Step 4: Mix Well
Stir the solution thoroughly to ensure uniformity.
Precautions
- Wear protective gloves and goggles when handling potassium hydroxide, as it is a strong base that can cause skin and eye irritation.
- Handle the solution with care, as it can cause burns if spilled on skin or surfaces.
- Store the prepared solution in a well-ventilated area, away from heat sources and incompatible materials.
Conclusion
By following this protocol, you can accurately prepare 100 mL of 0.1 M KOH solution for your laboratory applications. Remember to handle the solution with care and follow proper laboratory safety guidelines.
