need help with chem question

Question

What volume of 6.0 M acid is required for the preparation of 500.0 mL of 0.30 M solution?

Answer 1

This is a dilution problem moles of HCl is constant when water is added, so

n = M₁V₁ = M₂V₂ or moles and volume are in an inverse relationship for dilution and concentration.

You know M1, M2, V2 and are looking for V1 (You do not have to solve for n, and, because this is a proportion problem, you can use milliliters rather than having to change to liters)