How to Prepare a 0.1 M Sodium Hydroxide (NaOH) Solution- A Step-by-Step Guide_1

How to Prepare 0.1M NaOH Solution

Preparing a 0.1M (molar) NaOH solution is a common task in laboratories, particularly in chemistry and biology. NaOH, also known as lye or caustic soda, is a strong base that is used in various applications, including cleaning, soap making, and chemical synthesis. In this article, we will guide you through the steps to prepare a 0.1M NaOH solution accurately and safely.

Materials Needed

Before you begin, make sure you have the following materials on hand:

– Sodium hydroxide (NaOH) pellets or flakes
– Distilled water
– Measuring cylinder or graduated cylinder
– Stirring rod
– Safety goggles
– Gloves
– Lab notebook (optional)

Step 1: Calculate the Mass of NaOH

To prepare a 0.1M NaOH solution, you need to calculate the mass of NaOH required. The molarity of a solution is defined as the number of moles of solute per liter of solution. The molar mass of NaOH is approximately 40.00 g/mol.

For a 0.1M solution, you will need 0.1 moles of NaOH. To find the mass of NaOH, multiply the molarity by the molar mass:

0.1 moles NaOH × 40.00 g/mol = 4.00 g NaOH

So, you will need 4.00 grams of NaOH to prepare a 0.1M solution.

Step 2: Weigh the NaOH

Using a balance, weigh out 4.00 grams of NaOH pellets or flakes. Be sure to wear gloves and safety goggles to protect yourself from any potential contact with the caustic substance.

Step 3: Dissolve the NaOH in Water

Pour 100 mL of distilled water into a beaker. Add the weighed NaOH to the beaker and stir gently with a stirring rod until the NaOH is completely dissolved. It is essential to dissolve the NaOH in water rather than the other way around to prevent splashing and potential burns.

Step 4: Transfer the Solution to a Measuring Cylinder

Once the NaOH is dissolved, carefully transfer the solution to a 100 mL measuring cylinder or graduated cylinder. Be sure to avoid spilling any of the solution.

Step 5: Adjust the Volume to 100 mL

Add distilled water to the measuring cylinder until the solution reaches the 100 mL mark. It is crucial to measure the volume accurately to ensure the correct molarity of the solution.

Step 6: Stir the Solution

Stir the solution gently to ensure that the NaOH is evenly distributed throughout the water.

Step 7: Label and Store the Solution

Label the bottle with the concentration, date, and your initials. Store the solution in a labeled, tightly sealed container in a cool, dry place. Avoid exposure to moisture and light, as these can affect the stability of the solution.

Congratulations! You have successfully prepared a 0.1M NaOH solution. Always exercise caution when handling NaOH, as it is a corrosive substance that can cause severe burns. Remember to follow proper safety protocols and dispose of any waste materials according to local regulations.