Preparation of 0.1 M NaOH Solution
Introduction
Sodium hydroxide (NaOH) is a strong base commonly used in various laboratory applications, including titrations, cleaning, and pH adjustments. A 0.1 M NaOH solution is a common concentration used in many experiments. In this article, we will outline the steps to prepare a 0.1 M NaOH solution.
Materials
- Sodium hydroxide (NaOH) pellets
- Distilled water
- Balance or scale
- Volumetric flask (100 mL or 1000 mL)
- Stirring rod or magnetic stirrer
Preparation
Step 1: Calculate the amount of NaOH required
To prepare a 0.1 M NaOH solution, we need to calculate the amount of NaOH required. The molar mass of NaOH is 40.0 g/mol.
Molarity (M) = number of moles of solute / liter of solution
For a 0.1 M solution, we need:
moles of NaOH = Molarity x liter of solution = 0.1 mol/L x 0.1 L (for 100 mL solution) = 0.01 mol
grams of NaOH = moles of NaOH x molar mass = 0.01 mol x 40.0 g/mol = 0.4 g
Step 2: Weigh the NaOH pellets
Using a balance or scale, weigh 0.4 g of NaOH pellets.
Step 3: Add distilled water to the volumetric flask
Add a small amount of distilled water to the volumetric flask to dissolve the NaOH pellets.
Step 4: Dissolve the NaOH pellets
Add the weighed NaOH pellets to the volumetric flask and stir until the pellets are completely dissolved.
Step 5: Add more distilled water to the mark
Add more distilled water to the volumetric flask until the solution reaches the 100 mL or 1000 mL mark.
Step 6: Mix well and label the solution
Mix the solution well and label it as 0.1 M NaOH solution.
Tips and Precautions
- Always handle NaOH pellets with gloves and goggles to avoid skin and eye irritation.
- Use a fume hood when weighing and handling NaOH pellets.
- Store the 0.1 M NaOH solution in a tightly closed container to prevent contamination and evaporation.
By following these steps, you can prepare a 0.1 M NaOH solution for your laboratory needs.
