0.1 M Sodium Hydroxide Preparation
Sodium hydroxide (NaOH) is a strong base commonly used in various laboratory applications, including titrations, neutralizations, and pH adjustments. Preparing a 0.1 M sodium hydroxide solution is a fundamental task in many chemistry labs. In this article, we will guide you through the step-by-step process of preparing a 0.1 M sodium hydroxide solution.
Materials:
- Sodium hydroxide (NaOH) pellets
- Distilled water
- A 100 mL or 250 mL volumetric flask
- A balance or scale
- A stirring rod or spoon
Calculations:
To prepare a 0.1 M sodium hydroxide solution, we need to calculate the amount of NaOH required. The molar mass of NaOH is 40.0 g/mol. We can use the following formula to calculate the amount of NaOH:
moles NaOH = Molarity x Volume (in liters)
For a 0.1 M solution, we want to prepare 100 mL or 0.1 L of the solution. Let's calculate the moles of NaOH required:
moles NaOH = 0.1 M x 0.1 L = 0.01 mol
Now, we can calculate the mass of NaOH required:
mass NaOH = moles NaOH x molar mass = 0.01 mol x 40.0 g/mol = 0.4 g
Preparation:
- Weigh the NaOH pellets: Using a balance or scale, accurately weigh out 0.4 g of NaOH pellets.
- Transfer to a volumetric flask: Place the weighed NaOH pellets into a 100 mL or 250 mL volumetric flask.
- Add distilled water: Slowly add distilled water to the flask while stirring the mixture with a stirring rod or spoon.
- Dissolve the NaOH: Continue adding water and stirring until the NaOH pellets are completely dissolved.
- Dilute to the mark: Add more distilled water to the flask until the solution reaches the 100 mL or 250 mL mark.
- Mix well: Stir the solution well to ensure it is homogeneous.
Final Check:
- Verify the molarity of the solution by checking the pH using a pH meter or pH paper. The pH of a 0.1 M NaOH solution should be around 12.5-13.5.
Tips and Precautions:
- Always handle NaOH with gloves and goggles to avoid skin and eye irritation.
- Use a pipette or measuring cylinder to accurately measure the distilled water.
- Avoid splashing or spilling the solution, as it can be hazardous.
- Store the prepared solution in a tightly sealed container, labeled with the concentration and date.
By following these steps, you should now have a 0.1 M sodium hydroxide solution prepared and ready to use in your laboratory applications.
