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Purpose:
Preparing 0.2 M 250 ml NaOH solution?

Equipments and Materials:

Equipments:
-Balance
-Beaker(250ml)
-Graduated cylinder

Materials:
-Pure water
-NaOH

Procedure:
1)Calculate the required amount of NaOH in gr.
2)Weight calculated amount of NaOH in a beaker.
3)Disolve NaOH in distilled water.
4)Then fill the beaker with distilled water up to 250 ml.

Sure! I can help you with that. Here are the step-by-step instructions for preparing a 0.2 M 250 ml NaOH solution:

1) Calculate the required amount of NaOH in grams:
To calculate the required amount of NaOH, you need to know the molar mass of NaOH and the desired molarity. The molar mass of NaOH is approximately 40 g/mol.

First, determine the moles of NaOH needed:
Moles = Molarity x Volume (in liters) = 0.2 mol/L x 0.25 L

Next, convert moles to grams using the molar mass:
Grams = Moles x Molar mass

2) Weigh the calculated amount of NaOH in a beaker:
Using a balance, measure out the calculated amount of NaOH in grams and transfer it to a clean and dry 250 ml beaker.

3) Dissolve NaOH in distilled water:
Add a small amount of distilled water to the beaker containing NaOH and stir gently using a glass rod until it is completely dissolved. Be cautious as the dissolution of NaOH in water generates heat, so the beaker may become hot.

4) Fill the beaker with distilled water up to 250 ml:
After the NaOH has completely dissolved, use a graduated cylinder to add enough distilled water to fill the beaker up to the 250 ml mark. Gradually add the water while stirring gently to ensure thorough mixing.

Now your 0.2 M 250 ml NaOH solution is ready for use. Remember to label it properly with the concentration, substance, and date of preparation.

To prepare a 0.2 M 250 ml NaOH solution, you will need the following equipment and materials:

Equipment:
- A balance
- A 250 ml beaker
- A graduated cylinder

Materials:
- Pure water
- NaOH

Here is the step-by-step procedure to prepare the solution:

1) Calculate the required amount of NaOH in grams:
- Molar mass of NaOH = 22.99 g/mol (Na) + 16 g/mol (O) + 1.01 g/mol (H) = 39.99 g/mol
- Convert the desired molarity (0.2 M) to moles: 0.2 moles/L
- Multiply the molarity by the volume in liters to get the number of moles needed: 0.2 moles/L * 0.250 L = 0.05 moles
- Calculate the mass of NaOH needed using the molar mass: 0.05 moles * 39.99 g/mol = 1.9995 grams (rounding to 2 grams)

2) Weigh the calculated amount of NaOH in a beaker using a balance. Make sure to accurately measure the mass to 2 grams.

3) Dissolve the NaOH in distilled water:
- Add a small amount of distilled water to the beaker containing the NaOH. Start with a small amount to ensure complete dissolution.
- Stir the mixture gently with a glass rod until all the NaOH is dissolved. Heating can be used to speed up the dissolution process, but it is not necessary.

4) Fill the beaker with distilled water up to 250 ml using a graduated cylinder. Pour the distilled water slowly to avoid splashing or spilling.

Once you have completed these steps, your 0.2 M 250 ml NaOH solution is ready for use. Make sure to label the beaker appropriately with the concentration and date of preparation for future reference and safety.