How do I measure 100cm3 of 0.05 of sulphuric acid

1. Prepare the solution: First, you need to have a stock solution of sulfuric acid. If you are starting from a concentrated solution, you would first dilute it to a 0.05 M concentration.
2. Use a volumetric flask: A 100 cm³ volumetric flask is designed to contain exactly 100 cm³ of liquid when filled to the calibration mark.
3. Use a pipette: To accurately transfer the 100 cm³ of 0.05 M sulfuric acid, you would use a 100 cm³ pipette. Fill the pipette to the mark.
4. Transfer the acid: Carefully transfer the measured 100 cm³ of 0.05 M sulfuric acid from the pipette into your reaction vessel or storage container.

Note: If you need to prepare the 0.05 M solution from a more concentrated stock, the calculation would involve molarity and volume. For example, if you have a 1 M stock solution, you would use the formula M₁V₁ = M₂V₂ to find the volume (V₁) of the stock solution needed to make 100 cm³ (V₂) of a 0.05 M solution (M₂).

M₁V₁ = M₂V₂
(1 M) × V₁ = (0.05 M) × (100 cm³)
V₁ = (0.05 M × 100 cm³) / (1 M)
V₁ = 5 cm³

In this case, you would measure 5 cm³ of the 1 M stock solution using a pipette and then dilute it with distilled water in the 100 cm³ volumetric flask until the total volume reaches the mark.