0.1M KOH Preparation
Introduction
Potassium hydroxide (KOH) is a strong base commonly used in various laboratory applications, including analytical chemistry, chemical synthesis, and biological research. In this article, we will discuss the preparation of 0.1M KOH solution, which is a commonly used concentration in many laboratory procedures.
Materials
- Potassium hydroxide (KOH) pellets
- Distilled water
- Volumetric flask (100 mL)
- Balance
- pH paper or pH meter (optional)
Preparation
Step 1: Weighing KOH Pellets
Weigh 1.681 g of potassium hydroxide (KOH) pellets using a balance. This amount is equivalent to 0.01 moles of KOH, which is necessary to prepare 100 mL of 0.1M KOH solution.
Step 2: Transferring KOH Pellets to Volumetric Flask
Transfer the weighed KOH pellets to a 100 mL volumetric flask.
Step 3: Adding Distilled Water
Add about 50 mL of distilled water to the volumetric flask to dissolve the KOH pellets. Swirl the flask gently to ensure complete dissolution.
Step 4: Diluting to Volume
Add more distilled water to the flask to bring the total volume to 100 mL. Mix the solution well to ensure homogeneity.
Step 5: Checking pH (Optional)
Use pH paper or a pH meter to check the pH of the prepared KOH solution. The pH should be around 13, indicating that the solution is strongly basic.
Calculation
To calculate the molarity of the KOH solution, use the following formula:
Molarity (M) = Number of moles of KOH / Volume of solution (L)
In this case, the number of moles of KOH is 0.01 moles, and the volume of the solution is 100 mL or 0.1 L.
Molarity (M) = 0.01 moles / 0.1 L = 0.1 M
Therefore, the prepared solution is 0.1M KOH.
Conclusion
In this article, we have successfully prepared 0.1M KOH solution by dissolving 1.681 g of potassium hydroxide pellets in 100 mL of distilled water. This solution is commonly used in various laboratory applications, including titrations, chemical synthesis, and biological research.
