how to prepare 40% of Nitric acid from 70% of the Nitric acid solution

Is this percent w/v?

Use the dilution formula.
c1v1 = c2v2
c = concn
v = volume.

To prepare a 40% Nitric acid solution from a 70% Nitric acid solution, you can follow a simple dilution formula. Dilution is the process of adding a solvent, in this case, water, to decrease the concentration of the solute, which is Nitric acid.

Here's how you can prepare a 40% Nitric acid solution from a 70% Nitric acid solution:

1. Determine the amount of 70% Nitric acid solution you want to prepare. For example, let's say you want to prepare 100 mL of the 40% solution.

2. Calculate the amount of Nitric acid in the 70% solution that you'll need. To do this, multiply the final volume (100 mL) by the desired concentration (40%) to get the amount of Nitric acid required in the final solution. In this case, it would be 100 mL x 0.4 = 40 mL.

3. Determine the amount of water needed to make up the final volume of the solution. Subtract the amount of Nitric acid from the final volume to get the volume of water required. In this case, it would be 100 mL - 40 mL = 60 mL.

4. Measure 40 mL of the 70% Nitric acid solution using a graduated cylinder or pipette. Transfer it to a container (such as a beaker) in which you'll prepare the final solution.

5. Add about 60 mL of water to the container containing the 40 mL of the 70% Nitric acid solution. Gently mix or stir the solution to ensure thorough mixing.

6. Once the solution is thoroughly mixed, you will have prepared 100 mL of a 40% Nitric acid solution.

Remember to handle Nitric acid with caution as it is corrosive and potentially hazardous. Follow proper safety procedures, such as wearing gloves and protective eyewear, while working with chemical solutions.