- Safety goggles

- Laboratory gloves

- Measuring cylinder (10 mL)

- Transfer pipet

- Volumetric flask (1 L)

- Distilled water

- Concentrated HCl (12 M)

- Dropper

Procedure:

Step 1: Calculate the Volume Required

The formula to calculate the volume of a concentrated solution required is:

*Volume of concentrated solution = Molarity of desired solution * Volume of desired solution / Molarity of concentrated solution*

In this case, we have:

- Molarity of desired solution (HCl) = 0.05 N

- Volume of desired solution = 1 L

- Molarity of concentrated HCl = 12 M

Substituting these values into the formula, we get:

Volume of concentrated HCl = (0.05 N) * (1 L) / (12 M) ≈ 0.0042 mL

Step 2: Dilute the Concentrated HCl

1. Wear safety goggles and gloves.

2. Label a 1-L volumetric flask with "0.05 N HCl."

3. Using a dropper or a measuring pipette, carefully add 0.0042 mL of concentrated HCl to the volumetric flask.

4. Swirl the flask gently to mix the concentrated HCl with a small amount of distilled water.

Step 3: Make up to the Mark

- Add distilled water to the 1 L mark of the volumetric flask.

- Swirl the flask gently to ensure uniform mixing of the solution.

Step 4: Check the Concentration

- Use a conductivity meter or another appropriate method to ensure the exact concentration of the prepared 0.05 N HCl solution is within an acceptable range.

-If minor adjustments are needed, you might dilute further or add more concentrated acid to reach the desired normality.

Step 5: Store Properly

- Store the prepared 0.05 N HCl solution in a labeled and sealed glass bottle.

- Store the bottle in a cool and dark place to maintain its stability.