How many milliliters of 2 M NaCl solution are required to make 1 L of 0.4 M NaCl solution?

Question

How many milliliters of 2 M NaCl solution are required to make 1 L of 0.4 M NaCl solution?

Answer 1

1. Molarity of stock solution (M₁) = 2 M
2. Volume of diluted solution (V₂) = 1 L = 1000 mL
3. Molarity of diluted solution (M₂) = 0.4
4. Volume of stock solution (V₁) = ?
5. M₁V₁=M₂V₂
6. 2 * V₁= 0.4*1000
7. 2* V₁=400
8. V₁ = 200ml
9.